2a) Burner fan air pressure switch.
3a) Pilot gas valve.
4a) Ignition transformer.
5a) Motorized gas valves.
6a) MS4 AUX.
7a) MS8.
8a) Flame detector and burner chassis ground.
9a) Burner controller.
b)POSSIBLE SOLUTIONS;
1b) Verify that the burner controller module has power. With control voltage “ON,” verify that the burnt fuse L.E.D. indicator of fuse #6 is not “ON.”
•If the L.E.D. is “ON” check the fuse.
•If the fuse holder L.E.D. is “OFF” verify that MCR (motor control relay) pin #43 has 110 VAC, and that pin #1 of the burner controller is 110 VAC. The indicator light is on the left side of the burner base is the burner controller’s power indicator.
•If burner controller module has power, go to paragraph #9b on page 69.
•If burner controller module does not have power check circuit wiring and retest.
2b) Burner Fan Air Pressure Switch
This switch must be open prior to a drying cycle, and close during a drying cycle. This feature is required by the burner controller module. Check the function of this switch by measuring for 110 VAC from
Refer to
•Press the “green” button on the front panel; control voltage “ON.”
•Measure for 110 VAC between
•If a voltage is measured check;
•Air switch adjustment.
•Switch.
•Circuitry
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