Fire Chief FCOS1800D, User Manual

24

Problem: Draft blower will not run. NOTE: Verify that the wall thermostat is in the 

“HEAT” position, and make sure batteries are installed.

Possible Causes:

Remedies:

•  Defective wall thermostat.

•  This can be checked by turning the thermostat to a temperature 

setting that is higher than the temperature in your home. If the draft 

blower does not operate, the thermostat may be defective. Replace 

if necessary.

•  Move switch on wall thermostat to the “HEAT” position.

•  Replace transformer relay center.

•  Replace draft motor. 

•  Wall thermostat is in the wrong 

position.

•  Defective transformer relay 

center.

•  Defective draft motor.

4.

•  Review wiring diagram. If unit is wired correctly, seek professional 

assistance.

•  Improper wiring.

Problem: Circulation blower will not turn on.

•  Defective fan limit control.

•  Remove fan limit control cover and look for the word “Caution.” If it 

is upside down, replace fan limit. 

Possible Causes:

Remedies:

5.

Problem: Excessive dirt accumulation surrounding air registers in the home.

Possible Causes:

Remedies:

•  Furnace is not connected to 

return air duct and is disbursing 

dirt throughout home.

•  Connect to return air duct system.

•  Install filter and check frequently.

•  No filter in return air system.

6.

Problem: Circulation blower runs constantly. NOTE: Make sure the white button on fan 

limit control is pulled out and in the “auto” position.

•  “Off”setting on fan limit control is 

low.

•  Remove cover on fan limit control and check for the proper setting. 

The point indicators should be set at 100° “Off” and 160° “On.” 

Do NOT attempt to adjust the fan limit by manually adjusting the 

temperature indicators on the dial.

Possible Causes:

Remedies:

•  White button on fan limit control 

is pushed in.

•  Pull white button out and the blower should stop. 

•  Check by moving “ON” and “OFF” point indicator to a temperature 

position where blower should turn off. If the blower continues to run, 

replace the fan limit.

•  Review wiring diagram. If unit is wired correctly, seek professional 

assistance.

•  Open backdraft damper. 

•  Defective fan limit.

•  Improper wiring.

•  Backdraft damper is in the 

“closed” position.

7.