water heater 10 - butler technik · 7 mode of operation switch-on the pilot light in the switch or...

Troubleshooting and repair instructions

25 2081 95 12 57 11.1998 Modifications reserved Printed in Germany © Copyright J. Eberspächer GmbH & Co. C41

Eberspächer ®

Water heater 10

These troubleshooting and repair instructions are valid for the following heater versions

HYDRONIC 10

25 2081 05 00 00 - 12 V

25 2044 05 00 00 - 24 V

Contents Page

First check the following if faults occur ..................................... 2

Fuel quantity measurement ....................................................... 2

Function and fault test ............................................................... 3 – 6

Functional sequence ................................................................. 7

Wiring diagram HYDRONIC 10 – 25 2081 / 25 2044 ................. 8, 9

Wiring diagram HYDRONIC 10-TRS 003 – 25 2081 / 25 2044 .. 10, 11

Repair instructions ..................................................................... 12 – 14

J. EberspächerGmbH & Co.Eberspächerstr. 24D-73730 Esslingen

Telefon (zentral)(0711) 9 39-00Telefax(0711) 9 39-05 00http://www.eberspaecher.de

Visit www.butlertechnik.com for more technical information and downloads.

www.butlertechnik.com

2

Performance and malfunction test

Possible faults may be read-out by connecting adiagnostic device (order No. 221512890000) to linkB2 (see wiring diagram page 9). Operation seeoperating instructions for the diagnostic device. Listof faults below.

- When using the new module dial gauge, it is notnecessary to use a diagnostic device.

- When using the mini dial gauge displayed, theadapter cable (order No. 221000300500) has to beused together with the diagnostic device (orderNo. 221512890000).

Alternatively, a LED can be used instead of theoperating device to display the flashing code (h inwiring diagram). Fault signals can be found on thenext page.

Fuel quantity measurement

Caution: Only measure the fuel when the battery issufficiently charged. At least 11/22 V and max. 13/26 V asappropriate must be applied to the control unit during themeasurement.

1. Preparation

Detach the fuel line from the heater and place it in ameasuring glass (size: 50 cm3).Switch on the heater. When fuel is fed smoothly (about63 seconds after switch-on), the fuel line is filled and bled.Switch off the heater and empty the measuring glass.

2. Measurement

Switch on the heater.Fuel pumping starts about 63 seconds after switch-on. After another 105 seconds of pumping it isswitched off automatically.Wait for restart. If fuel pumping is switched offautomatically after another 75 seconds, switch offthe heater. Measure the fuel quantity in themeasuring glass.

Nominal value: 19 ml +/– 10 %

If the quantity of fuel is outside the tolerance,replace the metering pump.

First check the following if faults occur

Fuel in tank?

Heater lever (water valve) is „Hot” setting?

Fuses OK?

Electrical leads and connections OK?

Combustion air pipe or exhaust pipe clogged?



3

Fau

lt si

gnal

/ fla

shin

g co

deF

unct

ion

and

faul

t tes

t

Fau

lt co

deR

emed

yF

ault

desc

riptio

n

000

No

faul

t––

––––

––––

––––

––––

––––

––––

––––

––––

––––

–––

001

Ad

vanc

e w

arni

ng –

ove

rvol

tag

eC

heck

to s

ee if

vol

tag

e b

etw

een

13 a

nd 1

4 of

con

trol u

nit

(ext

erna

l plu

g)

is g

reat

er th

an 1

5 V

or

30 V

002

Ad

vanc

e w

arni

ng –

und

ervo

ltag

eC

heck

to s

ee if

vol

tag

e b

etw

een

13 a

nd 1

4 of

con

trol u

nit

(ext

erna

l plu

g)

is le

ss th

an 1

0 V

or

20 V

009

TRS

003

cut

out

Sw

itch

heat

er o

ff an

d o

n ag

ain

(TR

S c

ase

due

to D

+ o

r H

A/N

A m

ust b

e ca

ncel

led

)

010

Ove

rvol

tag

e cu

tout

Che

ck to

see

if v

olta

ge

bet

wee

n 13

and

14

of c

ontro

l uni

t(e

xter

nal p

lug

) is

gre

ater

than

15

V o

r 30

V

011

Und

ervo

ltag

e cu

tout

Che

ck to

see

if v

olta

ge

bet

wee

n 13

and

14

of c

ontro

l uni

t(e

xter

nal p

lug

) is

less

than

10

V o

r 20

V

012

Ove

rhea

tO

vert

emp

erat

ure

sens

or s

igna

ls te

mp

erat

ure

of g

reat

er th

an11

5 °C

. Im

ped

ance

at o

vert

emp

erat

ure

sens

or <

400

ohm

s.Ve

ntila

te h

eate

r (w

ater

leve

l too

low

). O

pen

the

heat

er s

lide

valv

e. C

heck

wat

er th

roug

hflo

w a

nd s

enso

r. C

heck

the

im-

ped

ance

at t

he c

ontro

l uni

t (in

tern

al p

lug

). F

or th

is p

urp

ose,

dis

man

tle th

e co

ntro

l uni

t, d

isco

nnec

t the

inte

rnal

plu

g fr

omth

e co

ntro

l uni

t and

mea

sure

the

impe

danc

e be

twee

n 5

and

8.O

vert

emp

erat

ure

sens

or v

alue

s:15

0 ko

hms

at –

25

°C

10

kohm

s at

+ 2

5 °C

013

Exc

ess

tem

per

atur

e at

flam

e se

nsor

Flam

e se

nsor

sig

nals

tem

per

atur

e of

gre

ater

than

700

°C

.Im

ped

ance

at f

lam

e se

nsor

> 3

400

ohm

s. C

heck

the

imp

e-d

ance

at t

he c

ontro

l uni

t (in

tern

al p

lug

). F

or th

is p

urp

ose,

dis

man

tle th

e co

ntro

l uni

t, d

isco

nnec

t the

inte

rnal

plu

g fr

omth

e co

ntro

l uni

t and

mea

sure

the

imp

edan

ce b

etw

een

10an

d 1

2. F

lam

e se

nsor

val

ues:

900

ohm

s at

– 2

5 °C

1

100

ohm

s at

+ 2

5 °C

014

Diff

eren

ce b

etw

een

over

heat

and

Tem

per

atur

e d

iffer

ence

bet

wee

n m

easu

rem

ents

of o

ver-

wat

er te

mp

erat

ue to

o la

rge

tem

per

atur

e se

nsor

s is

gre

ater

than

70

K. V

entil

ate

heat

er(w

ater

leve

l too

low

). O

pen

the

heat

er s

lide

valv

e an

d c

heck

wat

er th

roug

hflo

w. C

heck

the

over

tem

per

atur

e se

nsor

.C

heck

the

imp

edan

ce b

etw

een

5 an

d 8

at t

he c

ontro

l uni

t(in

tern

al p

lug

). O

vert

emp

erat

ure

sens

or v

alue

s:15

0 ko

hms

at –

25

°C /

10 k

ohm

s at

+ 2

5°C

015

Too

man

y ov

erhe

ats

The

cont

rol u

nit i

s in

terlo

cked

afte

r th

ree

succ

essi

veov

erhe

ats

(err

or c

odes

012

, 013

and

014

). E

limin

ate

the

case

of t

he o

verh

eat.

Unl

ocki

ng b

y d

elet

ing

the

erro

rm

emor

y w

ith d

iag

nosi

s un

it/P

C o

r p

lus

sig

nal f

or 0

.5 to

5se

c. o

n co

nnec

tion

7 (0

.5 v

) on

the

cont

rol u

nit (

ext.

plu

g)

with

hea

ter

switc

hed

on.

2

4

6

8

Sec

.

0

▼



4

Fun

ctio

n an

d fa

ult t

est

Fau

lt co

deR

emed

yF

ault

desc

riptio

n

020

Glo

w p

lug

inte

rrup

tion

Che

ck g

low

plu

g (

nom

inal

val

ue: a

pp

rox.

2 o

hms)

, rep

lace

itif

nece

ssar

y. C

heck

term

inal

4 (

1.5

whi

te)

on th

e co

ntro

l uni

t02

1S

hort

-circ

uit a

t glo

w p

lug

(inte

rnal

plu

g)

lead

ing

to g

low

plu

g to

term

inal

3 (

1.5

bro

wn)

for

cont

inui

ty/s

hort

-circ

uit.

If O

.K. →

rep

lace

con

trol u

nit.

033

Bur

ner

mot

or o

rS

pee

d d

evia

tion

for

long

er th

an 6

0 se

cond

s.sp

eed

con

trolle

r d

efec

tive,

Nom

inal

val

ues:

730

0 rp

m (

PO

WE

R),

570

0 rp

m (

HIG

H),

spee

d d

evia

tion

Nom

inal

val

ues:

360

0 rp

m (

ME

DIU

M),

200

0 rp

m (

LOW

).•

Che

ck b

urne

r m

otor

: ap

ply

sup

ply

vol

tag

e to

mot

or.

C

onne

ct +

to 1

.5 b

lack

and

– to

1.5

ora

nge.

Mot

or d

oes

no

t tur

n →

rep

lace

bur

ner

mot

or w

ith in

teg

rate

d s

enso

r.•

Che

ck s

enso

r su

pp

ly. S

witc

h on

hea

ter

and

mea

sure

vo

ltag

e b

etw

een

outp

ut 1

3 (0

.25

red

) an

d 1

4 (0

.25

gre

en)

at

the

cont

rol u

nit (

inte

rnal

plu

g).

Nom

inal

val

ue: 8

V. I

f

dev

iatio

n →

rep

lace

con

trol u

nit.

• C

heck

sen

sor:

Mea

sure

vol

tag

e b

etw

een

term

inal

15

(0.2

5

viol

et)

and

14

(0.2

5 g

reen

) w

ith a

n an

alog

vol

tmet

er w

hen

th

e b

low

er is

run

ning

. Nom

inal

val

ue: 4

V (

+/–

0.3

V)

aver

-

age

valu

e (8

V s

qua

re-w

ave

sig

nal).

If d

evia

tion

→ re

pla

ce

mot

or w

ith in

teg

rate

d s

enso

r. If

sens

or s

igna

l is

O.K

., th

en

the

spee

d c

ontro

ller

is d

efec

tive.

→ C

hang

e co

ntro

l uni

t.

037

Wat

er p

ump

is n

ot w

orki

ngC

heck

wat

er p

ump

(d

riven

ext

erna

lly

042

Sho

rt-c

ircui

t at w

ater

pum

p o

utp

utTe

st c

onne

ctio

n 6

(0.5

sw

rt)

on th

e co

ntro

l uni

t (in

t. p

lug

) fo

rsh

ort c

ircui

t. Te

st w

ater

pum

ps

and

cab

les

043

Sho

rt-c

ircui

t at e

xter

nal c

omp

onen

tsC

heck

term

inal

2 (

1 g

reen

) of

con

trol

uni

t (ex

tern

al p

lug

) fo

rsh

ort-

circ

uit.

Che

ck c

onne

cted

com

pon

ents

(m

ax. c

urre

nt6

A),

rep

lace

them

if n

eces

sary

.

047

Sho

rt-c

ircui

t of m

eter

ing

pum

pC

heck

term

inal

1 (

1 b

lue)

of c

ontro

l uni

t (ex

tern

al p

lug

) an

dle

ads

up to

met

erin

g p

ump

for

shor

t-ci

rcui

t/int

erru

ptio

n.04

8M

eter

ing

pum

p in

terr

uptio

nC

heck

the

met

erin

g p

ump

. Nom

inal

val

ue: a

pp

rox.

20

ohm

s.R

epla

ce if

nec

essa

ry.

050

Too

man

y fa

iled

sta

rts

The

cont

rol u

nit i

s in

terlo

cked

afte

r it

has

bee

n sw

itche

d o

n10

tim

es in

suc

cess

ion

(= 2

0 fa

iled

sta

rts)

with

out f

lam

ed

etec

tion

(fau

lt co

de

052)

. Che

ck th

e fu

el s

upp

ly, g

low

plu

g,

exha

ust p

ipin

g, c

omb

ustio

n ai

r p

ipin

g a

nd fl

ame

sens

or.

Unl

ocki

ng b

y d

elet

ing

the

erro

r m

emor

y w

ith d

iag

nosi

s un

it/P

C o

r p

lus

sig

nal f

or 0

.5 to

5 s

ec. o

n co

nnec

tion

7 (0

.5 v

) on

the

cont

rol u

nit (

ext.

plu

g)

with

hea

ter

switc

hed

on.

051

Flam

e m

essa

ge

is d

isp

laye

dFl

ame

sens

or s

igna

ls a

tem

per

atur

e of

gre

ater

than

80

°Cw

hen

heat

er is

sw

itche

d o

nd

esp

ite 4

min

utes

of c

oolin

g w

ith c

old

air.

Imp

edan

ce a

tfla

me

sens

or >

1300

ohm

. If n

o co

mb

ustio

n ta

kes

pla

ce →

chec

k th

e fla

me

sens

or, r

epla

ce it

if n

eces

sary

.Fl

ame

sens

or v

alue

s: 9

00 o

hms

at –

25

°C

1100

ohm

s at

+ 2

5 °C

Fau

lt si

gnal

/ fla

shin

g co

de

2

6

Sec

.

0

4

8

▼



5

Fau

lt si

gnal

/ fla

shin

g co

deF

unct

ion

and

faul

t tes

t

Fau

lt co

deR

emed

yF

ault

desc

riptio

n

052

Saf

ety

time

exce

eded

–N

o fla

me

was

det

ecte

d d

urin

g th

e st

art-

up p

hase

. Fla

me

heat

er d

oes

not s

tart

sens

or v

alue

of l

ess

than

80

°C (

1310

ohm

s). C

heck

the

fuel

sup

ply

, glo

w p

lug

, exh

aust

pip

ing

, com

bus

tion

air

pip

ing

and

flam

e se

nsor

.Fl

ame

sens

or v

alue

s:

900

ohm

s at

– 2

5 °C

Flam

e se

nsor

val

ues:

110

0 oh

ms

at +

25

°C

053

Flam

e lo

ss in

„P

ower

” se

tting

Hea

ter

has

star

ted

(fla

me

det

ecte

d)

and

ind

icat

es fl

ame

loss

in a

pow

er s

ettin

g. C

heck

fuel

flow

rat

e, b

low

er s

pee

d,

054

Flam

e lo

ss in

„H

igh”

set

ting

fuel

sup

ply

, exh

aust

pip

e an

d c

omb

ustio

n ai

r p

ipin

g.

If co

mb

ustio

n is

O.K

., ch

eck

flam

e se

nsor

, rep

lace

if05

5Fl

ame

loss

in „

Med

ium

” se

tting

nece

ssar

y.Fl

ame

sens

or v

alue

s:

900

ohm

s at

– 2

5 °C

056

Flam

e lo

ss in

„Lo

w”

setti

ngFl

ame

sens

or v

alue

s: 1

100

ohm

s at

+ 2

5 °C

059

Wat

er te

mp

erat

ur r

ises

too

qui

ckly

Che

ck w

ater

circ

ulat

ion

(012

) an

d te

mp

erat

ure

cont

rol

sens

or (

060/

061)

060

Tem

per

atur

e co

ntro

l sen

sor

inte

rrup

tion

Con

trol s

enso

r sig

nals

tem

pera

ture

val

ue o

utsi

de m

easu

re-

men

t ran

ge. C

heck

the

conn

ectin

g le

ads

(0.3

5 ye

llow

). Fo

r06

1S

hort

circ

uit i

n te

mp

erat

ure

cont

rol s

enso

rth

is p

urpo

se, d

ism

antle

the

cont

rol u

nit,

disc

onne

ct th

e in

tern

alpl

ug fr

om th

e co

ntro

l uni

t and

mea

sure

the

impe

danc

ebe

twee

n 9

and

11. I

mpe

danc

e be

twee

n te

rmin

als

9 an

d 11

of t

heco

ntro

l uni

t (in

tern

al p

lug)

: gre

ater

than

10

kohm

s (in

the

even

t of

inte

rrup

tion)

less

than

100

ohm

s (in

the

even

t of s

hort-

circ

uit)

Tem

pera

ture

sen

sor v

alue

s: 6

50 o

hms

at –

25

°C

10

00 o

hms

at +

25

°C

064

Flam

e se

nsor

inte

rrup

tion

Flam

e se

nsor

sig

nals

tem

per

atur

e va

lue

outs

ide

mea

sure

men

t ran

ge.

Che

ck th

e co

nnec

ting

lead

s (0

.35

065

Sho

rt c

ircui

t in

flam

e se

nsor

gre

en).

Imp

edan

ceb

etw

een

term

inal

s 10

and

12

of th

eco

ntro

l uni

t (in

tern

al p

lug

):g

reat

er th

an 5

0 ko

hms

(in th

e ev

ent o

f int

erru

ptio

n)le

ss th

an 1

00 o

hms

(in th

e ev

ent o

f sho

rt-c

ircui

t)Fl

ame

sens

or v

alue

s:

900

ohm

s at

– 2

5 °C

11

00 o

hms

at +

25

°C

071

Ove

rhea

t sen

sor

inte

rrup

tion

Ove

rhea

t sen

sor

sig

nals

tem

per

atur

e va

lue

outs

ide

mea

su-

rem

ent r

ang

e. C

heck

the

conn

ectin

g le

ads

(0.3

5 b

lue)

. Im

-07

2S

hort

circ

uit i

n ov

erhe

at s

enso

rp

edan

ce b

etw

een

term

inal

s 5

and

8 o

f the

con

trol u

nit

(inte

rnal

plu

g):

gre

ater

than

700

koh

ms

(in th

e ev

ent o

fin

terr

uptio

n) le

ss th

an 1

00 o

hms

(in th

e ev

ent o

f sho

rt-c

ircui

t)O

verh

eat s

enso

r va

lues

: 15

0 ko

hms

at –

25

°C

10

kohm

s at

+ 2

5 °C

090

Con

trol

uni

t def

ectiv

e (in

tern

al r

eset

)In

tern

al c

ontro

l uni

t err

or in

mic

rop

roce

ssor

/mem

ory

det

ecte

d.

093

Con

trol

uni

t def

ectiv

e (R

AM

faul

t)R

epla

ce c

ontro

l uni

t09

4C

ontr

ol u

nit d

efec

tive

(EP

RO

M fa

ult)

097

Con

trol

uni

t def

ectiv

e (g

ener

al fa

ult)

2

4

6

8

Sec

.

0

▼



6

Fau

lts w

hich

are

not

dis

play

ed:

F

aults

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7

Mode of operation

Switch-on

The pilot light in the switch or heating timer comes on whenthe heater is switched on. The combustion air blower andwater pump start and the preheating phase of the glowplug begins.After the preheating phase, which takes approx. 60seconds, the metering pump starts and fuel into thecombustion chamber. The fuel/air mixture ignites. Then thespeed of the combustion air fan increases together with thepulse frequency for the dosing pump continuously to thestage „MEDIUM”, then to „HIGH”, then if necessary to„POWER with 9500 watt”, to bring the combustion chamberup to temperature.Glow plug cutout is time-controlled. If no flame is detectedby the flame sensor, the heater is restarted.If no flame is detected when the heater is started for asecond time, the heater cuts out and a fault is displayed.The blower continues to run cool down the heater.

Heating operation

When the heater is first started up after switch-on, it worksin the „Power” setting 9500 W until

• either the water temperature exceeds the changeoverlimit „POWER”/„HIGH” (e.g. 72 °C),

• or the max. operating time in this setting (2 hours) isexceeded.

The heater then switches to the „HIGH-MEDIUM-LOW-OFF”settings depending on heat demand. If the cooling waterreaches 55 °C (for example), the temperature sensorswitches on the vehicle blower. The max. cooling watertemperature in the individual control steps is 85 °C.

• If heat demand is 7500 Watts or higher, the heateroperates in the „HIGH”setting. If the water temperaturedrops to 60 °C in the process, the heater switches backto the „POWER” setting.

• If heat demand is between 7500 Watts and 3200 Watts,the heater switches between „HIGH and MEDIUM”.

• If heat demand is 1500 Watts or less, the heater operatesin the „LOW” setting.If heat demand in the „LOW” setting is so low that thecooling water temperature reaches 85 °C, the heaterswitches from „LOW” to „OFF”. The blower continues torun for 210 seconds.The coolant pump continues to run until re-start of theheating device and vehicle fan.Once the temperature of the cooling water drops to 70 °C(for example), the heater restarts in the „MEDIUM”setting.

Control temperatures

VEHICLE BLOWERON 55 °C

POWER → HIGH 72 °C

HIGH → MEDIUM 78 °C

MEDIUM → LOW 79 °C

LOW → OFF 85 °C

OFF → MEDIUM 68 °C

MEDIUM → HIGH 68 °C

LOW → MEDIUM 73 °C

HIGH → POWER 60 °C

Speed ofblower motor

POWER – 7300 rpm

HIGH – 5700 rpm

MEDIUM– 3600 rpm

LOW – 2000 rpm

Time (s)

Speed of blower motor(rpm)

Glow plug

Blower motor rpm

Frequency ofmetering pump (Hz)

Startup sequence

0

1

2

3

4

5

6

7

8

0100 150 200 250 300 350 400 45050



8

Wiring diagram: Heater, standard version – 25 2081 / 25 2044



9

Wiring harness and operating elements, standard version – 25 2081 / 25 2044

Parts list1.1 Burner motor1.2 Glow plug1.5 Safety thermal cutout switch1.12 Flame sensor1.13 Temperature sensor

2.1 Control unit2.2 Fuel metering pump2.5.7 Vehicle blower relay2.5.18 Switch-over relay for water

circulation system, to be fittedby customer if required

2.7 Main fuse12 volt = 20 A24 volt = 15 A

2.7.1 Fuse for control switch 5 A2.7.5 Fuse for vehicle blower 25 A2.12 Water pump2.15.9 Sensor, external temperature

3.1.2 Heating switch (continuous operation)3.1.16 Key button, radio remote control3.2.9 Timer3.2.12 Timer "Mini 98" version3.3.6 Radio remote control

5.1 Battery

a) Connection for operating deviceb) External control for water pump

(with plus signal)c) Water circulation changeover:

relay closes at a water temperatureof 68 °C and opens at 63 °C

d) Ignition (terminal +15)e) Vehicle blower step switchf) Light (terminal 58)g) Connection for heaterh) Display, flashing code (optional)

(LED at choice, series resistor 1.5 kohms)

i) Connection for external heating key

k) Connection leads in plug B2, B4 or B5

a2) Diagnosisa3) Switch-on signal, S+a4) Plus supply, +30a5) Minus supply, –31a6) Battery separating switch (+) on / off

(diode: order number 208 00 012)

* Length A – B and C – D:< 5 m: cross-section 4 mm2

> 5 m < 8 m: cross-section 6 mm2

Plug housing and socket housing are shownfrom the conductor entry side

Cable colours

sw = blackws = whitert = redge = yellowgn = greenvi = violetbr = browngr = greybl = blueli = lila2044602B.



10

Wiring diagram: Heater, TRS 003 version – 25 2081 / 25 2044



11

Wiring harness and operating elements, TRS 003 version – 25 2081 / 25 2044

Parts list1.1 Burner motor1.2 Glow plug1.5 Safety thermal cutout switch1.12 Flame sensor1.13 Temperature sensor

2.1 Control unit2.2 Fuel metering pump2.5.7 Vehicle blower relay2.5.18 Switch-over relay for water

circulation system, to be fittedby customer if required

2.7 Main fuse12 volt = 20 A24 volt = 15 A

2.7.1 Fuse for control switch 5 A2.7.5 Fuse for vehicle blower 25 A2.12 Water pump

(max. additional load: 4 A)

3.1.2 Heating switch (continuous operation)3.2.9 Timer

5.1 Battery

a) Connection for operating deviceb) External control for water pump

(with plus signal)c) with TRS D+ (alternator)d) with TRS HA– (auxiliary drive /

secondary drive) / minus switchConnect lead to + pole if unavailable

e) Water circulation changeover:relay closes at a water temperatureof 68 °C and opens at 63 °C(with D+ 58 °C / 45 °C)

f) Ignition (terminal +15)g) Vehicle blower step switchh) Display, flashing code (optional)

(LED at choice, series resistor 1.5 kohms)k) Connection leads in plug B2 or B6l) Connection for heaterm) Light (terminal 58)

n) Connection for external heating key

a1) TRS feedbacka2) Diagnosisa3) Switch-on signal, S+a4) Plus supply, +30a5) Minus supply, –31a6) Battery separating switch (+) on / off

(diode: order number 208 00 012)

* Length A – B and C – D:< 5 m: cross-section 4 mm2

> 5 m < 8 m: cross-section 6 mm2

Plug housing and socket housing are shownfrom the conductor entry side

Cable colours

sw = blackws = whitert = redge = yellowgn = greenvi = violetbr = browngr = greybl = blueli = lila

2044601B.



Repair steps

Remove / install

1. Control unit2. Glow plug cable3. Glow plug4. Safety thermal cutout switch/temperature sensor/water pump5. Cover/blower6. Flame sensor/heat exchanger fastening screws

7. Housing including heat exchanger, dismantled 8. Burner 9. Burner, dismantled10. Heat exchanger11. Heat exchanger, dismantled

12

Overall view of heater



Remove / install

13

1. Control unit (on installation of the control unit, grease the gasket with sealing paste)

4. Safety thermal cutout switch/temperature sensor/water

3. Glow plug 6. Flame sensor/heat exchanger fastening screws

5. Cover/blower (on installation of the cover, clean the sealing surface and apply liquid seal)

2. Glow plug cable



7. Housing including heat exchanger, dismantled 10. Heat exchanger

9. Burner, dismantled

8. Burner 11. Heat exchanger, dismantled

14



water heater 10 - butler technik · 7 mode of operation switch-on the pilot light in the switch or...

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