I have an error code on the Fenway ignition system that is stating air flow fault - 1 flash. The blower is not coming on. I have tried everything I know how to check and cannot get the blower to come on. Help please.
AFS is the air flow switch that senses if the blower is on and there is sufficient air flow to the burner. Sequence is blower motor should turn on, AFS senses air flow through a white tube down by the burner can, and switch closes to start the ignition sequence.
You can gently blow into the white tube and you should hear the click of the air flow switch turning on. Check the white tube for cracks or breaks. The white tube is not available as a separate part and comes with the Pentair MasterTemp & Sta-Rite Max-E-Therm Air Flow Switch assembly P/N 42001-0061S.
If you hear the air flow switch closing then check the continuity of the air flow switch relay using a multimeter. Connect the multimeter to the two contacts on the air flow switch after removing the heater wires. You should see it electrically open when no air is blown into the switch and closed when air pressure is through the tube.
Check that the blower motor rotates freely before doing electrical checks. Sometimes the blower has began running by simply cleaning debris from the fan area or removing the cover to the blower motor and using a screwdriver to manually turn it.
Note: No guarantees on anything. Only do what you know that you can do safely. Do at your own risk.
The blower has 3 sets of windings. 2 main run windings and an auxiliary start winding. Red and blue go to one set of windings. Black and yellow go to the other set.
For 120 volts, the windings are in parallel.
For 240 volts, the windings are in series.
The auxiliary start winding is in parallel with the black --> yellow winding.
Remove the capacitor and test for resistance from red to blue and black to yellow. The values should be the same.
Label the capacitor wires C1 and C2.
Test from C1 to C2, C1 to black, C1 to yellow and C1 to white.
Test from C2 to black, C2 to yellow and C2 to white.
Test from each wire to the green ground wire to see if any wires are shorted to ground.