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Go to the blower motor find 3 wires.Black is high,blue is med, red is slow. Find what wire is on blower relay. then adjust to what you what. hope this helps.
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A 25 sec run time, to me, acts like a high temp limit is opening. This is caused by things being dirty like the blower wheel, air filter, evaporator coil. Could also be the limit at fault. Could also be due to a slow blower motor caused by a weak capacitor or weak motor winding/wrong speed. I've seen some have too much leaving gas pressure, at the gas valve, allowing it to over fire and overheat. Most of these issues should be addressed by an experienced tech. Cleanliness, or the lack of, is the cause of most issues I see.
Very carefully give the blower wheel a spin and see if the thing takes off and spins. If so, you need to replace the capacitor on the indoor blower. It gives it the "boost" it needs to get going
Some companies do sell a variable speed kit. It includes the motor and controls. Get your model and serial number of your unit and contact your local Payne dealer. The can locate the proper kit if available for you.
When you turn the on/off switch to on you are turning on the "fan switch" and the blower motor is only coming on. When you turn the switch to cool and move the tempature control lever down you are turning on the air conditioner...So it sounds like your heater is not working. Is the heater electronic ignition or does it have a pilot? If it has a pilot the heater may not be working because the pilot is out and will need to be lit. If it is electronic ignition you will need to inspect the unit to determine what component is faulty. Could be the igniter,gas control valve,ect. Verify that gas is not shut off to unit at line valve and gas control valve on unit.
I am giving you a link to the expanded view of your unit. The fuse is marked #30 on the schematic and you can see where it is located on the schematic. Its a 3 amp fuse. If it won't kick on, you need to reset your breaker in your main breaker box manually. Don't trust that it "looks" ok, pysically reset it. Then reset the breakers that are on the unit its self and test that you have voltage to the unit. If you do, then you need to test for the unit being told to come on by the thermostat. This will be 24 volt. Check that the transformer is getting power and the power leaving it is 24v. If the unit isn't being called to come on and you have 24v, it's the thermostat. If it is being called and you have all the voltages and they are correct, you will need to look at the sequencer and the blower relay. You will find this in the the expanded view. Hope this helps.
could be the fan relay is bad. or the run capacitor. if these check good. you may have a bad heat sequencer. hard to tell, if you thave a/c you can turn thermostat fan swith to on and if blower comes on then relay and capacitor should be ok. some units have two or three heat sequencers 1 controls fan and the others control heat strips hopefully this helps good luck
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