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7.1 TROUBLESHOOTING
SYMPTOM
Burning of gas-air mixture
inside plenum (flashback).
Delayed ignition.
Low ceramic surface
temperature, excessive
rollout or soot on rods.
Control system overheating.
Gas odor.
Heater cycles repeatedly.
No spark; no ignition.
Heater lights, and "locks
out" after approximately 10
seconds.
Spark is present. No main
gas operation. Unit "locks
out".
Heater will not shut off.
POSSIBLE CAUSE
1. Heater mounted at incorrect angle.
2. Excessive drafts.
3. Gas leaking at orifice, spud, pilot tube.
4. Separation of ceramic grids.
5. Ceramic grids cracked.
1. Electrode out of specification.
2. Low gas pressure.
3. Partially blocked orifice.
4. Improper orifice size.
5. Incorrect gas.
1. Dirty or plugged rayhead ceramics.
2. Partially blocked orifice.
3. Low inlet gas pressure.
4. Low manifold gas pressure.
5. High manifold pressure.
6. Foreign matter in venturi tube.
7. Misaligned manifold from excessive
torque applied on pipe during
installation.
8. Excessive dark spots on rayhead.
9. Gas supply piping too small.
10. Incorrect gas.
1. Heater not mounted correctly.
2. Heater mounted too close to ceiling.
1. Loose pipe connection.
1. Heater located in drafty area.
2. Low gas pressure.
3. Thermostat located in drafty area.
4. Defective flame detector.
1. Lack of 120V or 24V incoming
voltage.
2. Open high voltage wire.
3. Improper electrode gap.
4. Loose or open wire connection.
5. Poor or no equipment ground.
6. Unit in "safety lockout" mode.
7. Defective "Gaslighter" control.
8. Defective mercury sensor.
9. Defective pilot ignition transformer.
1. Poor or no equipment ground.
2. Polarity is reversed.
3. Low gas pressure.
4. Electrode not sensing.
5. Heater mounted at incorrect angle.
1. Gas valve in "OFF" position.
2. Defective main valve solenoid.
3. Defective "Gaslighter" control.
1. Defective thermostat or wiring.
2. Gas valve stuck open.
3. High gas pressure.
CORRECTIVE ACTION
1. Mounting angle 20º-35º from horizontal.
2. Relocate or shield from draft.
3. Check with leak detector solution.
4. Replace rayhead.
5. Replace rayhead.
1. See Ignition System insert.
2. See Section 3.1, Gas Supply.
3. Clean or replace.
4. Consult dealer.
5. See unit nameplace.
1. See perodic maintenance instructions.
2. Remove and clean.
3. See Section 3.1, Gas Supply.
4. Adjust main valve regulator for 6" W. C.P.
natural gas, 10" W. C.P. propane.
5. Adjust main valve regulator for 6" W. C.P.
natural gas, 10" W. C.P. propane.
6. See periodic maintenance instructions.
7. Replace manifold.
8. See periodic maintenance instructions.
9. Increase inlet pressure or replace
undersize piping.
10. See unit nameplate.
1. Mounting angle 20º-35º from horizontal.
2. Observe clearance to combustibles
safety chart located on heater reflector.
1. Check all connections with leak-
detector solution, tighten as
necessary.
1. Relocate or shield from draft.
2. See Section 3.1, Gas Supply for
propane.
3. Relocate thermostat.
4. Replace.
1. Clean or adjust pilot.
2. Isolate and ohm for resistance,
replace if 0.
3. See Ignition System insert.
4. Check all wires, tighten or replace.
5. Trace ground wire for complete
circuit back to equipment ground
from control.
6. Interrupt power source, repeat
trial for ignition.
7. Replace.
8. With element cold, isolate control.
Ohm for resistance between 3 & 4.
replace if 0.
9. Replace.
1. Check all connections, provide
positive earth ground.
2. 120V to black, neutral to white.
3. See Section 3.1, Gas Supply.
4. Relocate or replace if defective.
5. Mounting angle 20º-35º from
horizontal.
1. Turn to "ON" position.
2. Isolate and check for resistance.
replace if 0.
3. Replace.
1. Replace or repair.
2. Replace.
3. See Section 3.1, Gas Supply.
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