Maytag POF1HD091AVFA, Installation, Operation And Maintenance Manual

20.  MAINTENANCE AND SERVICE 

Routine Maintenance By Home Owner

Other than remembering to arrange for the annual 
professional servicing of the furnace by the service or 
installation contractor, the most important routine service 
performed by the homeowner is to maintain the air filter 
or filters. A dirty filter can cause the furnace to over-heat, 
fail to maintain indoor temperature during cold weather, 
increase fuel consumption and cause component failure. 

The furnace filter(s) should be inspected, cleaned or 
replaced monthly. The furnace is factory equipped with a 
semi-permanent type filter. If the filter is damaged, 
replace with filters of the same size and type. (See Parts 
Listing Ref. No. 21).  

During the routine service, inspect the general condition 
of the furnace watching for signs of oil leaks in the vicinity 
of the oil burner, soot forming on any external part of the 
furnace, soot forming around the joints in the vent pipe, 
etc. If any of these conditions are present, please advise 
your service or installation contractor. 

Annual Service By Contractor

THE COMBUSTION CHAMBER (FIREPOT) IS 
FRAGILE. USE CARE WHEN INSPECTING AND 
CLEANING THIS AREA. 

The heat exchanger should be inspected periodically and 
cleaned if necessary. If cleaning is necessary, 

SHUT 

OFF POWER TO THE FURNACE

 and remove the 

burner. Using a stiff brush with a wire handle, brush off 
scale and soot from inside the drum and flue pipe. To 
clean the radiator, remove the clean-out caps screws, 
and remove the caps carefully to avoid tearing the 
gaskets.  A wire brush can be used to loosen dirt and 
debris on the inside surfaces of the radiator. Clean out all 
accumulated dirt, soot and debris with a wire handled 
brush and an industrial vacuum cleaner. Before replacing 
the clean-out caps, inspect the gaskets. If the gaskets 
are broken, remove the remnants and replace with new 
gaskets.  

The blower motor is factory oiled and permanently 
sealed.  

DO NOT LUBRICATE

. Excess oil causes 

premature electric motor failure. 

Inspect the blower fan. Clean if necessary. 

Oil Burner Maintenance: Follow the instructions of the oil 
burner manufacturer. (See oil burner manufacturer's 
instructions supplied with furnace or burner). It is 
advisable to change the oil burner nozzle and oil filter on 
an annual basis. 

The venting system should be cleaned and inspected for 
signs of deterioration. Replace pitted or perforated vent 

pipe and fittings. The barometric damper should 
open and close freely. 

All electrical connections should be checked to 
ensure tight connections. Safety controls such as 
the high limit controls should be tested for 
functionality. The fan control should be checked to 
ensure that the fan on and off delay function 
continues to start and stop the blower fan at the 
optimal settings. 

21.  OPERATING INSTRUCTIONS 

(POF1HD140AVFA and POF1HD091AVFA) 

Before Lighting 

Open all supply and return air registers and grilles. 
Open all valves in oil pipes.  Turn on electric power 
supply 

To Light Unit 

Set the thermostat above room temperature to call 
for heat. The burner should start. NOTE: It may be 
necessary to press the RESET button on the 
primary combustion control relay. 

There will be a fan on time delay before the 
circulating fan is energized.  The 

United 

Technologies 1168-1

 has an adjustable fan on/off 

time delay that is programmed into the ECM motor, 
and is set by selecting the SW4 DIP switch 
combination displayed in Table A-10 page 15.  

Fan 

on/off delay must be adjusted according to input 
(nozzle size).

Set the thermostat below room temperature. The oil 
burner should stop. 

The air circulation blower will continue to run until 
the blower off delay setting programmed into the 
ECM motor times out. 

To check the operation of the limit switch, shut off 
power to the furnace. Temporarily remove the 5 pin 
power connector plug from the ECM blower motor.  

NOTE: Isolate the AC Line pins on the 5 pin 
power connector with electrical tape to prevent 
electric shock hazard.

   Restore the electrical 

power to the furnace and set the thermostat above 
room temperature. 

After three or four minutes of burner operation, the 
limit control should turn the burner off. When the 
limit function test is complete, shut off electrical

power to the furnace, replace the 5 pin power plug to 
the blower fan motor, and then restore power. The 
blower fan will start up immediately. Once the 
temperature has dropped and the limit control has 
reset, the fan will operate until the fan off time is 
achieved. The oil burner will then resume operation 
and continue until the thermostat is satisfied. 

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