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Author:
greenunivega (NJ)
I have a 13 year old P-WTGO-3 Gold series boiler with tankless coil that won't stay running. Its been a problem which comes and goes over the past 2 years. I have replaced every part on the boiler with the exception of the low water cut off switch. I should also mention that I converted the boiler from oil to nat. gas about 10 years ago with a Wayne conversion burner. Its never missed a beat and I highly recommend it. There is no automatic damper control. Water level and pressure are normal. I replaced the Honeywell limit switch control box twice and both times it seemed to fix the problem for some time. Now to the actual problem...The boiler won't stay on. I turn on the main reset switch and the boiler fires like normal most of the time. Every now and then I have to cycle the switch a few times before it will actually fire up. The boiler will go through its normal run and stop at the indicated temperature on the limit switch. The circulator pump will turn on and warm the house. But once the thermostat is satisfied and theres a period of time until the next call for heat (or need for domestic hot water) the temperature of the boiler will fall past the lower limit and go cold. The boiler never refires. If I turn the main switch off and back on, the boiler will fire back up and repeat the process. There were times when it would go back into a normal cycle and run fine for weeks or months without another problem, or it might happen again. No rhyme or reason, and I checked the ground and actually ran a new power wire back to the breaker box. And I have replaced the thermostat, new batteries and even a new thermostat wire. And if I toggle the thermostat up and down I can here it clicking but it never triggers the boiler to fire. I'm going nuts! Could it be the lower limit switch even if its not showing low water? What else??? Thanks in advance!
Mark S.
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Author:
packy (MA)
have you called honeywell tech support?
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Author:
stuckinlodi (MO)
If the low water cutoff switch isn't too costly or difficult to replace why not try changing it? Does it activate by a float or some other means to detect the low water condition?
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Author:
Paul48 (CT)
Using a volt meter, you should be able to tell what is preventing the boiler from firing. Certainly a tech should be able to do it, in a few minutes.
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Author:
greenunivega (NJ)
No I haven't called them yet.
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Author:
greenunivega (NJ)
I jumped the low water switch and it's been running fine. There must be a problem with circuit board inside or something. The red light is not on. I'll replace it.
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