davestewart53
New member
I had the same problem with mr heater maxx 50k btu garage heater with the 60105 control board tried to light 3 times then shut down with flame rod sensor error easy way to check it connect the voltmeter 200 volt AC scale to the flame sensor and to ground on the heater chassis
A good board will read 140 vac reducing to 105 VAC when lit and running you can also connect the meter in series with the flame rod sensor it should be 3.5 to 5 ma when running if it is 0 then check the AC voltage at the flame sensor as previously described
Mine was 0 vac and i found that the resistor that connects to the flame sensor tab on the control board 1 M Ohm was open circuit so I replaced it and it gave me the full 140 vac to 105 Vac voltage and started on the first cycle
I hope this helps as the support could not tell me if there was any voltage or not on the flame sensor rod
There should be as no voltage no current draw when the flame starts and the board cannot hold the gas valve open
A good board will read 140 vac reducing to 105 VAC when lit and running you can also connect the meter in series with the flame rod sensor it should be 3.5 to 5 ma when running if it is 0 then check the AC voltage at the flame sensor as previously described
Mine was 0 vac and i found that the resistor that connects to the flame sensor tab on the control board 1 M Ohm was open circuit so I replaced it and it gave me the full 140 vac to 105 Vac voltage and started on the first cycle
I hope this helps as the support could not tell me if there was any voltage or not on the flame sensor rod
There should be as no voltage no current draw when the flame starts and the board cannot hold the gas valve open