Truma problem solved

RogerV

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Truma heater C3402 fault.

Symptoms, switch set to heat the room. Light green, water hot, room blower works for a few minutes very slowly.

Possible cause, dud room thermostat.

The test is to disconnect from pcb upon which the blower should run full blast.

However, before delving into whichever dark depths your boiler resides in check that the room thermostat is clean. After cleaning and still not working correctly possibly thermostat dud or other fault.

The room thermostat is a plastic disc often located adjacent to the control panel. The diameter is between a 1p and a 2p coin. The end cap clips into place.

Talking to one of the gents at AR Electronics (refurbishers of components and much else) was the first time anyone had suggested the room thermostat being the problem.
 

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