503
Thermo G
5 Troubleshooting
5.3
Malfunction code output via flash
code
The kind of malfunction is indicated from the operating
indication light through a flash code, and if a standard
timer is used, on the display (operating indication) respec-
tively.
The flash code is immediately generated after detection of
the malfunction and will be kept while the heater is
powered on until the heater is freed.
The flash code comprises of a burst (sequence) of 5 short
flashes depicting the break and a defined number of long
pulses corresponding to the malfunction number, which
are to be counted. After that the cycle starts with 5 short
flashes again and so on.
The meaning of the number of long pulses is shown in the
table below.
Error in the fuel supply
No fuel supply to the heater
•
empty gas tank
•
bent, closed, clogged or leaky lines
•
frozen water inlets in the gas regulator or in the gas
line
•
closed gas supply valve
•
solenoid valve 1 or 2 don‘t open
•
defective gas pressure regulator
Faults in combustion
combustion irregularly
•
the speed of the combustion air fan is too low
•
defective combustion air fan
•
restricted combustion air supply
•
restricted gas supply
•
the methane content of the gas doesn’t match requi-
rements (min. 95% by volume)
•
contaminated combustion air intake grille
Table 503 General error symptoms
Error symptom
Possible cause
Burst
Break
flash
impuls
nth
flash
impuls
Break
Burst
Flash code output
