[AnneJ1501]

We've had this problem for several years and HVAC service men can't find the problem. Occasionally, (4 times in the past 2 years) our furnace turns on but the burners won't fire. If we shut the furnace off (at the thermostat) and leave it off for 1 hour and turn it on, the furnace works fine. All 4 times HVAC repairmen have come out and can't find the problem. Does anyone have any suggestions as to what the problem might be?

Thanks,

[hvac1000]

Does the circuit board show any blinks if the furnace you have has a circuit board?

Does this furnace have a brand name and a exact model number?

[AnneJ1501]

The furnace is a York Model P2MP. I'll ask my husband about the circuit board.

[hvac1000]

Four times in two years is extremely intermittent. One thing as a homeowner you can do is clean the flame sensor. For some reason this little part causes many problems with modern day furnaces. Stay away from the item called the ignitor when you are cleaning the flame sensor since they are very easily broken. Also never touch the ignitor in the black areas since that can damage it. Sometimes the ignitor is in a close relationship with the sensor. Below is a few pictures of sensors. Clean with steel wool,scotch brite pad or sand paper.

[AnneJ1501]

Thanks for your help. We'll try it and see what happens. Have a great weekend.

[hvac1000]

Same to you.