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Remove the top cover and rotate the fan by hand. If should turn pretty easily. If not may you can put some oil where the shaft passes through the ends otherwise you will need a new motor. If the fan turns easily then the capacitor is probably shot. I don't know if you can get the capacitor seperate from the motor or not. There is a small low pressure compressor attached to the back of the motor. Your problem may also lie in there. The covers come off easily so you can check it out.
Well I would try cleaning with a compressor and blow gun to clean the panel out. Remove the panel and blow air thru all of the holes backwards and forwards until nothing comes out but clean air. Be careful when seating them back in their holder to seat them properly. I believe that this will help with your problem.
The problem is withthe venting. Your vent pipe goes out of the house in such a way as to catch the air when it is windy and cause the pressure switch to cut out. The flame may only run for a short time, then shut down and then restart. The heat exchanger never gets hot enough to give you warm air.
Check where the vent pipes exit the house. Try adding on an elbow and turning it so that the wind cannot blow back the pipe. Turning it down towards the ground often is good. Make sure that the exhaust cannot recirculate back to the intake pipe also.
Also check that there is no water build up hanging in a pool where the vent pipe may have sagged a bit. this will make the pressure switch much more sensitive.
I hope that this will help you to solve your problem!
When the cover is off it totally changes the airflow through the burner chamber. There is no thermal overload on this heater. The flame sensor not sensing flame is what causes the heater to shut off. Make sure the fuel filter is clean. It is located under the grommet where the fuel line enters the tank. Remove the nozzle and clean it by blowing backwards through it with compressed air. If the heater is very old the nozzle should be replaced. Set the air pressure to between 4 and 5 psi. This should cur your problem. Let me know if you have any questions.
1st take a air gun and blow in the fan to clear of debris. 2nd make sure to push your reset button on the back by your fan. Last you can calibrate your flame/heat by removing the fan housing & you will find 2 set screws try a small 1/16 turn on them and try to run, should run better for you.