Pilot light on Glow Work Fuelsaver Mk2 wont stay on
- Thread starter ChrisRH
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My experience is the opposite, on the 24v honeywell g.v's I have replaced loads that have held afterwards. I think it is a cumulative loss of power through all the components though that causes it to fail so ideally you'd replace them all but you may strike it lucky with one or two. imho.
From an electronic point of view that is bad practice. The output power from a thermocouple is very small so the detector in the gas valve has to be sensitive to react to it.
With the low impedance of the thermocouple connected across the input to the gas valve induced voltages at the sensor input (from other wiring) will be close to zero. Disconnect one side of the thermocouple from the detector and induced voltages across the detector will rise. If the detector is, a simple but sensitive solenoid that holds operated on the current from the thermocouple then it is unlikely that induced voltage will do any harm. That said the ignition electrode firing could put a large energy spike onto the thermocouple leads.
If the detector circuit involves electronic semi-conductor components then open circuiting one side of the thermocouple is more likely to result in damge to the detector circuitry.
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Worrying innit? 
Having designed industrial temperature measuring equipment that used thermocouples as the sensors I consider I my knowledge about thermocouples and their use in heat ( and flame ) detection is accurate and valid. How many hours were spent in the training room on the use of thermocouples ?
Why is it that so called experts come on here and make a simple job on a simple boiler out to be so complicated is beyond me. Or is it just their inflated ego's? Answers on a postcard please Bernard.
Also for what it's worth, the gas valve is the last thing to consider on these.
Also for what it's worth, the gas valve is the last thing to consider on these.
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Edit... Wrong boiler.
Actually... It wasn't the wrong boiler... What circuitry?
Bernard! What circuitry.!
Can you hear the Google servers creaking under the strain . Perhaps he'll just ignore these questions like he did the cooker thread.
. Perhaps he'll just ignore these questions like he did the cooker thread.DIYnot Local
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