G'day,

I have a Payne PG8MAA042090 gas heater and I believe it's rated as 90,00 BTUs at 80%.

This unit was installed in December 2002 due to t house inspection when I purchased the house. Shortly after that I installed a LUX1500 programmable thermostat from Home Depot and this combo has been working as designed ever since.

I've never been overjoyed with the performance ( temp at registers always seemed like warm at best, but it did get the job done.

During the last two 3 week when the heat cycled on, the house would get warm and the system would shut off, but within several minutes would come on again for approx 5 minutes and then shut off. Last Sunday the system kicked on at approx 4AM and stayed on until I got up at 6AM. I checked the register - cool air. Thermostat said the house was at 60 but the called for temp was set at 64. The fan continued to run and no matter what I did at the thermostat the burner would/will not light. L I eventually turned the fan off at the furnace switch.

Research on the net suggest it may be the fan limit control switch or motor capacitor.
It's not hard to find the capacitor but with out and IPB or manual the limit control switch is not jumping out at me.

So, a couple of questions:

Is this unit worth the time, effort, and $ to repair or should it be replaced?

Is there a maintenance manual I can get for this unit?

Thx

Bob

The unit is only 6 years old should last 15/20 years.
New units are 90+ on efficiency so that is a brownie point for a new one.
Price of a new unit installed is very expensive so that is less one brownie point

Looks like a even race so far.

When was the last time you had your unit professionally serviced?
It is probably time for that.
It is possible you have a thermostat problem causing the system to run to often or not enough.

It is also possible you have another problem with the furnace. The flame sensor might be dirty or need to be replaced. Look on the wiring diagram on the inside of the blower to see if you unit has a flame sensor.

hvac1000,

Thx for the info. Service was 2 yrs ago and was not a "fun" process. The culprit turned out to be the programmable thermostat; not the component I would have looked at, but never the less it was/is faulty.

I appreciate your comments.

Bob