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The boiler does not fire when hot water is selected although the red light is on. However the boiler fires ok when central heating is switched on and this does then heat the water. Is the problem in the programmer

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Hi. and you are correct, if the boiler fires when the controller is set for central heating to come on, but does not fire when calling for hot water, the controller is either faulty, or not programmed properly. This is what tells the boiler to do on command, so, this is all that it could be.If you no anything about this controller as far as how it is set up, is it a programmable one, voltage on it, does it have wiring terminals on it that are labeled and can you get to them? If you can, and the wires are labeled, you can jumper them out to see if you can bypass the circuitry and get it to fire up on a call for hot water. This is the way to test it, very easy. You have to look at the wiring schematics to find the wires that are 1-hot and 2- hot water control. Jump across the 2 wires and if it fires, the controller is faulty. Careful if this is a high voltage controller as 120/208/230 volt. Check this out first. It can still be done, you just have to be careful not to ground yourself out. It maybe 24 volts. If it is higher voltage, you can kill power and get a insulated lead/jumper wire with clips on each end. Clip them to the terminals you want to jump out and turn on power. This way you are not touching anything. Please let me know the outcome on this and please when rating me as being helpful to you, be kind. I thank you. I will be here if you have more questions or need my help.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Posted on Jul 07, 2010

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