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If The PF shows and emits a beep then the temperature sensor is malfunctioning. If the problem continues then call customer service at 1-800-332-3848. When you unplug unit the code should clear if not then there is a problem with unit. DO NOT try to keep running unit this could cause a fire.
on start up the clicking noise is normal as well as knocking noise ....one important item with fan , if the fan was removed cleaned and then reinstalled with power to unit could have ruined the fan and it will have to be replaced..... Cant tell you why is wasn't firing before with no codes...other than flow sensor not working( most likey stopped with sand fragments or trash) the flow sensor detects hot water demand and ignites heater and if clogged it will not light up but doesn't give error code and the water running through hot side will be cold..... flow sensor is a turbine that detects water movement and lets heater light..... may want to get serviceman to check this out and clean turbine.... hope this helps...
Sounds like limit switch issue. Furnace heats up, high temp limit switch opens, fan will stay on. GMP model is older and do not have the codes.
May be over fired, have airflow problem, to cause the limit to open.
Next time before shutting off power, try to find the limit, it has two wires that connect to a 1.5 x 2 inch card mount to the furnace fire wall. tap on it and see if the blower stops. If so replace the limit.
I am not to sure of the trouble codes on Mr.Heater but this is usually a fuel related problem. My routine maintenance is remove top half of heater and clean fuel system from nozzle back to the tank.Remove nozzle,clean the screen behind the nozzle they corrode over the summer sometimes inspect the nozzle for corrosion or damage. Inspect lines back to pump then to filter. The filter can be cleaned out with compressed air and a blow gun blowing air thru the filter backwards. Now check the fuel line to the tank and make sure it is submerged in the fuel. Before putting the top on locate the fire sensor and give it a quick cleaning with windex and soft terry cloth rag. Put your heater back together and check air filter to pump clean it and fire away. This works 90 percent of the time. Good luck!
Try cool it down, and give it a break (if you have used it constantly over a long time). Otherwise you could try clean it for dust, some heaters sucks alot if dust into themselves. Last option is to get to the customer support at the store you bought it at, and tell them you're problem, they will help you gladly, and probably give you a new one if they can't fix it ;)