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I have a vaillant 242 EH Will not ignite?The Vaillant VCW-GB 242EH wiil not run on either central heating or DHW. I have followed the manual which said replace the Flame ignition circuit board, but it still does not run. The pump, fan work but no voltage at spark transformer. Think it is the thermostatic CB but need to be sure, any ideas.
Graham Smith December 2007
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A little update for those with similar problems. After changing the flame supervision board and still having the same problem i started poking around the electronics a little more. I began to suspect the fan board and tried running the boiler with all the pcbs pulled out of the control box, so that i could see the fan relays actuating. It turned out that the APS relay was not actuating hence the lack of ignition. I pulled the board out and had a real good look around. The relay looked ok with the correct resistance to the coil and the contacts made ok. Following the circuit diagram in the manual showed a capacitor and diode in series with the relay coil., It turned out that there was a dry joint on the capacitor. A quick drop of solder on the joints and the boiler fired up fine. Job done. It took a careful eye to see the dry joint. Shame i spent near on 100 quid for a flame board. Doh!!!
Dave Dee December 2007 |
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I've not got an answer, but I'm experiencing exactly the same problem. Turn it on, pump runs, fan starts, no voltage at spark transformer. I replaced the flame ignition board but still its exactly the same. Before it went pear shaped, it was tempremental and often required a little knock on the side to get it sparking and igniting. I'm reluctant to shell out for a thermo board when they are near on £100 after already buying the flame board. I suspected one of the relays was sticking, but there arent any on the thermo board. Did you manage to resolve your problem?
Dave Dee December 2007 |
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