HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hi,This is risky business, not responsible for damages on your end. We keep going until you're satisfied. I come and go. be patient.
Its showing signs of two defects but its probably just one... a failed flame sensor..
try this first, find a long rod (flame sensor) poking into the pilot or main burner flame and sand it off .. get back to me with how that worked.
We can go from there.
replaced it with no luck helping the problem
The flame sensor operates by bleeding half its 24volt power supply to ground *through* the flame to the pilot light metal.. if the gas pressure is a bit high the pilot flame will not touch the pilot light shround and cause the flame sensor not to work.
Look that over for me.
If its not that we can look at the following in this orderr:
The fact that this sudden restart you mention does not require a reset (such as after it shuts down after 5 tries).. indicates a problem with the electronics, or with loose connections.
Try this, unplug and replug all the gang connectors and connections to the control card.. and see if that changes anything.
I will be thinking about what the 5 minute aspect of the shut down might be abour.. it could be a condensate trap issue.
Does this unit have a 2" plastic exhaust or a 4" metal one
We can go from there, Phil
Sorry for the delay...just got back! Ok...I am not certain what the pilot light shround is or what I should be looking at exactly...we have a 4 inch metal exhaust.
Thanks.. find the main gas valve in the furnace by following the gas line, its a square valve with wires attached
a pencil size aluminum tube is attached to that valve. thats for the pilot light.. follow that tube, on the end of it is the pilot light, with a tin thing on it that deflects the flame (shroud).. tweek that if necessary to the flame blows hard and strong onto the main burners. Next to the pilot, and in the pilot flame is the thermocouple flame sensor.. sand that clean if you want.
Get back to me, Phil