Boiler burner is only turning on when the boiler temp falls below 125 and staying on until heat is 140. If I fiddle with the boiler temperature knob or the outside reset diff knob it will cause the burner to keep running for a bit longer to a higher temperature but it seems to fall back into it's 125/140 pattern shortly after. We replaced a zone valve recently and it may have had this problem since them but has just not been noticed.
I have:
- removed and cleaned the temp sensor. Temp sensor seems accurate when left out and is reading the same as the actual temperature gauge on the boiler.
- readjusted the boiler temp to max and back (usually keep at 190)
- readjusted the outside temp diff. settings
- shut off and restarted the boiler
In the manual for this boiler and control panel there is a mention of a thermal purge feature where the boiler runs the circulator but does not turn on the burner if the water is above 140. Also, the bypass circulator mixes incoming water that is lower than 140 with warmer water form the boiler. Oddly, both of these settings are 140, the same temperature the boiler keeps shutting the burner off at.
I have read the manual for the boiler and the control and they are both a little lean on details. I think there should be an additional reset or adjustment somewhere. It seems to me it has to be the boiler control but I can't figure out what it could be.
I would love to hear your suggestions, advice
I have:
- removed and cleaned the temp sensor. Temp sensor seems accurate when left out and is reading the same as the actual temperature gauge on the boiler.
- readjusted the boiler temp to max and back (usually keep at 190)
- readjusted the outside temp diff. settings
- shut off and restarted the boiler
In the manual for this boiler and control panel there is a mention of a thermal purge feature where the boiler runs the circulator but does not turn on the burner if the water is above 140. Also, the bypass circulator mixes incoming water that is lower than 140 with warmer water form the boiler. Oddly, both of these settings are 140, the same temperature the boiler keeps shutting the burner off at.
I have read the manual for the boiler and the control and they are both a little lean on details. I think there should be an additional reset or adjustment somewhere. It seems to me it has to be the boiler control but I can't figure out what it could be.
I would love to hear your suggestions, advice