Troubleshooting Repair Guide 0918
5
1c. The water level in the boiler is so low that not enough pressure builds up and
the safety thermostat is triggered. This is caused by a failure of the water level
sensor SEM0011/A (see picture 6) and possibly also a boiler pump failure.
Clean or exchange the sensor. ATTENTION! Always exchange the 3/8” copper
washer/seal ring MAP0006 if the sensor is removed for cleaning or substitution.
Do not over-tighten the sensor or the protective Teflon sheath will be damaged
causing a short circuit and signal failure. (See chapter 9 for boiler pump)
Pic. 6
Pic. 7
Pic. 8
1d. If pressure is shown but no temperature, inspect the special temperature
sensor for the temperature display. This sensor “K” MAP0451 (see pictures 7
& 8) may be disconnected or faulty, inspect and repair or exchange. (Check
the Fast-on's with which sensor K connects to the PCB, sometimes these are
crimped over the cables isolation sheath causing a faulty connection which
comes and goes).
1e. The heating element could be faulty or the cables leading to it. Inspect and
repair or exchange the heating element and/or cables.