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Maytag POF1HD140AVFA Installation, Operation And Maintenance Manual page 25

Oil fired warm air furnaces, up-flow model with ecm
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Table C-3: Oil Primary Control Troubleshooting
Procedure
10. Check cad cell.
Disconnect line voltage power
and open line switch.
Remove existing cad cell and
replace with new cad cell.
Disconnect all wires from
thermostat terminals to ensure
that there is no call for heat.
Reconnect line voltage power
and close line switch.
Expose new cad cell to bright
light such as a flashlight.
11. Check cad cell bracket
assembly.
Disconnect line voltage power
and open line switch.
Remove cad cell wires from
quick connect connectors on
and leave control lead wires
open.
Apply power to device.
Place jumper across cad cell
terminals after burner motor
turns on.
NOTE: Restricted Mode - (Limited Reset): In order to limit the accumulation of unburned oil in the combustion chamber, the
control can be reset only 3 times, after which, the control locks out. The reset count returns to zero each time a call for heat is
successfully completed.
To reset from R
M
ESTRICTED
reset.
NOTE: Disable function: Pressing and holding the reset button will disable all functions until the button is released. The burner
will restart at the beginning of the normal heat cycle on
Table C4: System and General Troubleshooting
Problem
Furnace will not start.
continued.
Status
Indicator light is on.
Indicator light is off.
Indicator light is on.
Indicator light is off.
: press and hold the reset button for 30 seconds. When the LED flashes twice, the device has
ODE
Possible Cause
Thermostat not calling for heat.
No power to furnace.
Thermostat faulty.
Oil primary control faulty.
Corrective Action
Remount control onto burner housing. Go to step 6.
Go to step 11.
Replace cad cell bracket assembly.
Replace oil primary control.
.
SAFETY CHECK
Check thermostat and adjust. Also, check thermostat for
accuracy; if it is a mercury switch type, it might be off level.
Check furnace switch, main electrical panel furnace fuse or
circuit breaker. Also look for any other hand operated switch,
such as an old poorly located furnace switch, which was not
removed during furnace replacement.
Remove thermostat wires from oil primary control terminals T-T.
Place a jumper across T-T. If furnace starts, replace thermostat,
thermostat sub-base (if equipped), or both.
Check reset button on oil primary control. Remove thermostat
wires from oil primary control terminals T1 - T2. Check for 24V
across T -T. If no voltage is present, check for 115V to oil
primary control. If 115V is present, go to Table C-3.
25
Remedy

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