Maytag POF1HD091AVFA, Installation, Operation And Maintenance Manual

OIL PRIMARY CONTROL LED DIAGNOSTIC 
LIGHT 

The LED diagnostic light has several functions. It 
indicates the state or mode in which the oil burner is 
operating. It will also indicate fault conditions, and help 
determine cad cell resistance while the burner is 
operating. 

NORMAL CONDITIONS

: 

The LED diagnostic light will turn on when the burner 
enters the carryover state; the point at which ignition 
spark is on, and will remain on through the run state, 
where the ignition spark is terminated but the burner 
continues to fire. 
The LED diagnostic light will turn off at the end of the 
burner cycle as the oil primary control enters the idle 
state, and will remain off until the next heating cycle. 

FAULT CONDITIONS: 

If the LED diagnostic light is flashing quickly; 1 Hz (½ 
second on / ½ second off), the oil primary control is in 
the lockout state or in restricted mode. To exit the 
lockout state, press the reset button. 

If the LED diagnostic light is flashing slowly; ¼ Hz (2 
seconds on / 2 seconds off), the oil primary control is 
in the recycle state. This indicates that flame sensing 
was lost after the lockout timer expired during the 
ignition carryover state. The oil primary control will 
return to the idle state within 60 seconds.

CAD CELL CONDITION

: 

If the LED diagnostic light is off, the cad cell is not 
sensing flame. 

If the LED diagnostic light is on, the cad cell is sensing 
flame, or viewing ambient light. 

The resistance of the cad cell may be checked while 
the oil primary control is in the run state by pressing 
the reset button. The LED diagnostic light will flash the 
following code

: 

Table C-2: Cad Cell Resistance 

Flashes 

Resistance in Ohms 

1 

Less than 400 

2 

Between 400 - 800 

3 

Between 800 – 1600 

4 

Between 1600- 5000

TROUBLESHOOTING 

IMPORTANT: Due to the potential hazard of line 
voltage, only a trained, experienced service technician 
should perform the troubleshooting procedure. 

PRELIMINARY STEPS: 

Check the diagnostic light for indications of burner 
condition. Refer to the oil primary control LED 

DIAGNOSTIC LIGHT

 section for details. 

WHEN SIMULATING A CALL FOR HEAT AT 
THE OIL PRIMARY CONTROL, DISCONNECT 
AT LEAST ONE THERMOSTAT LEAD WIRE 
FROM THE T1 - T2 TERMINALS TO PREVENT 
DAMAGE TO THE THERMOSTAT. 
NEGLECTING THIS PROCEDURE MAY BURN 
OUT THE HEAT ANTICIPATOR OF A 
STANDARD 24 VAC THERMOSTAT, OR 
CAUSE HARM TO COMPONENTS WITHIN A 
MICRO-ELECTRONIC THERMOSTAT. 

Before checking the oil primary control, perform these 
preliminary checks, (repair or replace controls as 
necessary): 

•

Check the power supply; fuse box or breaker, 

any service switches, all wiring connections, and 
burner motor reset button (if equipped). 

•

Check the limit switches to ensure that the 

switch contacts are closed. 

•

Check the electrode gap and position. 

•

Check the contacts between the oil primary 

control and the electrodes. 

•

Check oil supply (tank gauge). 

•

Check the oil nozzle, oil filter, and oil valves. 

•

Check the piping or tubing to the oil tank. 

•

Check the oil pump pressure. 

CHECK OIL PRIMARY CONTROL AND 
IGNITER 

If the trouble does not appear to be in the burner or 
ignition hardware, check the oil primary control and the 
igniter by using the following equipment: 

Screwdriver. 

Voltmeter (0 - 150 V

AC

) 

Insulated jumper wires with both ends stripped.

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