1104UESAGBEN, page 29/31
General troubleshooting
PROBLEM
PROBABLE CAUSE
REMEDY
Venter motor
will not start
1. No power to unit.
1. Turn on power, check supply fuses or circuit breaker.
2. No power to venter motor.
2. Check connections at burner relay and/or venter motor terminals.
3. Integrated burner relay defective.
3. Replace burner relay.
4. Defective venter motor.
4. Replace venter motor. See Section 26.
5. Fluse blown (F3.1).
5. Replace fuse.
6. Fuse burner relay blown.
6. Replace fuse.
7. LC1 open.
7. a) Set heater on ventilation until LC1 closes.
b) Replace LC1.
c) Check if there is obstruction at the fan side.
8. LC3 open.
8. a) Reset LC3.
b) Replace LC3.
9. Unit in lock-out.
9. Push on reset button.
10.Room thermostat open.
10.Set thermostat above room temperature.
Burner will
not light
1. Main valve not operating.
1. a) Check voltage on valve during ignition period.
b) Check connector on main gas valve.
c) Check connector on burner relay.
d) Replace valve.
2. Air in the gas line.
2. Purge gas line.
3. Gas pressure too high or too low.
3. a) Supply pressure should be 20 mbar for natural gas or 37 mbar for propane gas.
b) Obstruction in the gas line.
c) Gas line connection diameter too small.
4. No Spark:
4. Check the following :
a) Loose wire connections.
a) Be certain all wire connections are solid.
b) Incorrect spark gap.
b) Maintain spark gap at 3 mm.
c) Spark cable has a short circuit to ground.
c) Replace worn or grounded spark cable.
d) Spark electrode has a short circuit to ground.
d) Replace if ceramic spark electrode is cracked or grounded.
e) Burner relay not grounded.
e) Check burner relay ground wire.
f) Unit not properly grounded.
f) Make certain unit is properly
fi
eld grounded (earthed) and properly phased (L1 to
hot lead L2 to neutral).
g) Faulty burner relay.
g) If voltage is available to the burner relay and all other causes have been elimi-
nated, replace burner relay.
5. Combustion air pressure switch
5. First check the following :
not closing upon power to venter.
a) Make sure unit is properly vented.
b) Remove obstructions from vent.
c) Replace faulty tubing to pressure switch.
d) Replace faulty pressure switch.
e) Check condensate drains for obstruction
Burner cycle
on and off
1. Gas pressure too high or too low.
1. Supply pressure should be 20 mbar for natural gas or 37 mbar for propane gas.
2. Burner relay not grounded.
2. Check burner relay ground wire connection.
3. Faulty burner relay.
3. If (220/240) volts is available to the burner relay and all other causes have been
eliminated, replace burner relay.
4. Flame sensor grounded.
4. Be certain
fl
ame sensor lead is not grounded or insulation or ceramic is not
cracked. Replace as required.
5. Cracked ceramic at sensor.
5. Replace sensor.
6. Incorrect polarity.
6. Check polarity switch and if necessary reverse line voltage wires to terminal
block connections.
Fan motor
will not run
1. Circuit open.
1. Check wiring and connections.
2. Defective burner relay
2. Replace burner relay
3. Defective motor.
3. Replace blower & motor.
Blower or
venter motor
turns on and
off while
burner is
operating
1. Motor internal thermal protection device cycling
on and off.
1. Check motor load against motor rating plate. Replace motor if needed.
