Gas Boiler - on & off, on & off, on & off - ???

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Old 01-10-07, 05:04 PM
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Question Gas Boiler - on & off, on & off, on & off - ???

Having a problem. Hoping someone can help. Here's some specs to start:

FURNACE:
Weil-McLain CG Boiler, Model #CG-4-PIDN, Series #11
Natural Gas, Intermittent Pilot
Has Honeywell S8620C Continuous Re-try 100% Shutoff IP
Forced hot water heating -- not forced air
1991 ?

THERMOSTAT:
Honeywell, electronic, about a year old

PROBLEM:
When the thermostat drops below set temp, the furnace comes on as it should. But it doesn't stay on steadily. The burner lights, stays on ~ 5 seconds, turns off. Burner re-lights, stays on ~5 seconds, turns off. This patterns repeats until the house reaches the temperature setting on the thermostat (no matter how long that takes). The system is able to maintain correct temperature but it seems to take it longer to achieve the desired temp than it used to.

This is a relatively new problem (maybe started a month ago?) as of this winter. The furnace (and thermostat) worked fine last year.
 
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Old 01-10-07, 05:28 PM
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Possibly the flame sensor is not detecting flame and constantly retrying.

Ken
 
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Old 01-11-07, 01:34 PM
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Originally Posted by KField View Post
Possibly the flame sensor is not detecting flame and constantly retrying.

Ken
Thanks for the response, and apologies for selecting the wrong forum. Re: the flame sensor - any idea how I could test that? If that is the problem, what's the typical remedy? Replacing the sensor?
 
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