505
Thermo E+ 120/200/320
5 Troubleshooting
5.5
Error symptoms during functional
tests with malfunction code output
5.5.1 Error symptom "No start within safety
period"
If due to a malfunction the heater unsuccessfully
attempted to start eight times in a row, it will be inter-
locked.
No further start attempts will be tried.
The heater lock-out overrides the standard fault lock-
out.
The procedure for releasing the heater interlock can be
found in point
.
The "No start within safety period" error symptom does
not always indicate that no ignition took place.
This symptom occurs as well, if the heater fails to enter
heating operation (heating or auxiliary heating state) after
successful ignition, e.g. in case the fuel supply is inter-
rupted.
5.5.2 Error symptom "Flame interruption"
If due to a malfunction flame interruption occurs during
heating operation five times in a row, the heater will be
locked-out.
No further start attempts will be tried.
The heater interlock overrides the standard fault lock-out.
NOTE:
After above mentioned error symptoms occur, trouble-
shooting according to
is recommended.
In principle, the correct supply of electrical energy, sig-
nals, fuel and air, respective the discharge of fuel and
exhaust gas must be checked.
The procedure for a heater lock-out release is outlined in
point
Table 503 Error symptom "No start within safety period“ and “Flame interruption“
Medium
Kind of check /
error symptom
Possible cause
Fault elemination
Electrical energy and
signals
When the heater is switched
on, the burner motor does not
start.
Fault lock-out, heater lock-out
Fault lock-out release,
heater lock-out release
Faulty power supply to the
heater
Connect electrical connec-
tions or replace damaged
parts
Faulty or damaged power
supply to the burner motor of
the heater
Check / repair power supply
to burner motor
Burner motor defective
Check / replace burner motor
Combustion air
Insufficient combustion air
mass
–
Combustion air intake
opening or line, fan wheel
or exhaust pipe not com-
pletely free or not proper-
ly secured
–
Fan wheel not properly
secured
–
Air loss at the burner or
heat exchanger
–
Clean and securely
mount the combustion air
intake opening and line
and the exhaust pipe
–
Properly secure the fan
wheel
–
Check screw connections
on burner and check all
parts for damage
Insufficient fresh air as
combustion air
Polluted air, aspiration of
exhaust fumes
Aspirate clean air, prevent
aspiration of exhaust fumes
Continued on next page
Summary of Contents for Thermo E+ 120
Page 64: ...memos...
