40
Installation Guide for Comfort Pack (CPG) Units
TROUBLSHOOTING
PROBLEM
PROBABLE CAUSE
REMEDY
Venter motor will not start
No power to unit
1.
No 24 volt power to integrated circuit board.
2.
Integrated circuit board fuse blown.
3.
Integrated circuit board defective.
4.
Defective motor.
5.
Turn power, check supply fuses or circuit breaker
1.
Turn up thermostat; check control transformer output
2.
Correct cause. Replace fuse (type ATC, 24VAC, 3A)
3.
Replace integrated circuit board
4.
Replace motor
5.
Burner will not light
Manual valve not open
1.
Air in the gas line
2.
Gas pressure too high or too low
3.
No spark:
4.
a. Loose wire connections
b. Transformer failure
c. Incorrect spark gap.
d. Spark cable shorted to ground
e. Spark electrode shorted to ground
f. Burner not grounded
g. Circuit board not grounded
h. Integrated circuit board fuse blown
i. Faulty integrated circuit board
Lockout device interrupting control circuit by
5.
above causes
Faulty combustion air proving switch
6.
Main valve not operating
7.
a. Defective valve
b. Loose wire connections
Integrated circuit board does not power main
8.
valve
a. Loose wire connections
b. Flame sensor grounded
c. Incorrect gas pressure
d. Cracked ceramic at sensor
Open manual valve
1.
Bleed gas line (initial startup only)
2.
Correct supply pressure is 5” - 14” w.c. for natural gas or
3.
11” - 14” w.c. for propane gas
4.
a. Be certain all wire connections are solid
b. Be sure 24 volts are available
c. Maintain spark gap at
1
/
8
”
d. Replace worn or grounded spark cable
e. Replace if ceramic spark electrode is cracked or
grounded
f. Make certain integrated circuit board is grounded to
ignitor
g. Make certain integrated circuit board is
grounded to furnace chassis
h. Correct cause; replace fuse (type ATC, 24VAC, 3A)
i. If 24 volt is available to the integrated circuit board
and all other causes have been eliminated, replace
board
Reset lockout by interrupting control at the thermostat or
5.
main power
Replace combustion air proving switch
6.
7.
a. If 24 volt is measured at the valve connections and
valve remains closes, replace valve
b. Check and tighten all wiring connections
8.
a. Check and tighten all wiring connections
b. Be certain flame sensor lead is not grounded or
insulation or ceramic is not cracked. Replace as
required
c. Correct supply pressure is 5” -14” w.c. for natural
gas or 11” - 14” w.c. for propane gas
d. Replace sensor
Burner cycle on and off
Gas pressure too high or too low
1.
Burner not grounded
2.
Circuit board not grounded
3.
Faulty integrated circuit board
4.
Faulty combustion air proving switch
5.
Flame sensor grounded
6.
Cracked ceramic at sensor
7.
Correct supply pressure is 5” -14” w.c. for natural gas or
1.
11” - 14” w.c. for propane gas
Make certain integrated circuit board is grounded to
2.
ignitor
Make certain integrated circuit board is grounded to
3.
furnace chassis
If 24 volt is available to the integrated circuit board and
4.
all other causes have been eliminated, replace board
Replace combustion air proving switch
5.
Be certain flame sensor lead is not grounded or
6.
insulation or ceramic is not cracked; Replace as required
Replace sensor
7.
No heat (heater operating)
Incorrect valve outlet pressure or orifice
1.
Cycling on limit control
2.
Improper thermostat location or adjustment
3.
Check valve outlet pressure
1.
Check air throughput
2.
See thermostat manufacturer’s instructions
3.
Cold air delivered
Incorrect valve outlet pressure
1.
Check valve outlet pressure
1.
Unit blower motor will not
run
Circuit open
1.
Defective Integrated circuit board
2.
Defective motor
3.
Check wiring and connections
4.
Replace board
5.
Replace motor
6.
Unit blower motor turns
on and off while burner
is operating
Motor overload device cycling on and off
1.
Check motor lead against motor rating plate; replace motor if
1.
needed
Unit blower motor cuts out
on overload
Low or high voltage supply
1.
Defective motor
2.
Poor air flow
3.
Defective bearing or lubrication
4.
Correct electric supply
1.
Replace motor
2.
Clean motor, fan, fan guard, filter and coils
3.
Lubricate bearings or replace motor
4.
