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vaillant ecoTEC plus 428 displaying fault 98?

Hi - We cannot get the central heating to work however the hot water and underfloor heating in the kitchen is ok. We have checked the pressure in the boiler, bled the radiators and also replaced the batteries in the thermostat. Not sure what to do?

DC
October 2012

Vaillant Heating, Home Heating Systems Vaillant Central Hot

Has room start has power check 4and5 terminal got power in PCB to find out that on signal coming from from start link 4and5 with piece of wire if OK than98code flow or return sensor is blocked

ltd
October 2012

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vaillant ecoTEC plus 428 displaying fault 98?

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