Troubleshooting (Quick Diagnosis) 4
Heater
gives
off
too
little heat (applies to electronic control units
1561
,
1561
GT
and
1561
GS)
YES
NO
Heater switched on
Is
heater operating
at
lull
load?
(Speed at rated voltage, see
sect.1)
lsCO,valueokay?
Room thermostat
has
regulated temperature
Wiring fault
Check exhaust
silencer
and
exhaust pipe
Check delivery rate
of
metering pump
(check Installation location)
Clean heat exchanger.
Replace matting.
Check drive unit
(check
speed)
YES
1---------1
Check voltage
'---------1
Check
combustion
air
quantity and
simultaneously fuel
quantity
Heater
shuts
down
due
to
faults
during
heating
operation
(applies to electronic control units 1561,
1561
GT and
1561
GS)
Is
heater functioning properly
Check metering
pump
for
proper functioning
during
heating operation?
-
(Installation location).
Check ambient temperature if
motor
overheats
Has safety thermostat
-
Adjust
co,value
Adjust
CO,value
Check
CO,value
See item above:
-
"Is
CO
2
value
okay?
-
continuity?
-
Check max. permissible resistance
of
healing air tubes
I
Has safety switch
continuity?
---
Check safety switch
11
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