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Not enough heat 1. Heater undersized. 1. This is especially true when a dwelling or room is
enlarged. Have the heat loss calculated and compare
to the heater output (70% of input). Your gas company
or installer can supply you with this information. If
heater is undersized, replace with correct size unit.
2. Temperature dial set too low. 2. Raise setting of temperature dial. See “Lighting and
Shutting Down Instructions”.
3. Incorrect gas supply pressure. 3. Check gas supply pressure and regulator pressure as
outlined above.
Too much heat 1. Temperature dial set too high. 1. Lower setting of temperature dial. See “Lighting and
Shutting Down Instructions”.
2. Combination control valve sticks open. 2. Replace combination control valve.
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
TROUBLE SHOOTING CHART - POOR HEATING RESULTS - Cont’d.
Burner won’t light 1. Pilot flame too large or too small. 1. Re-adjust pilot flame using adjustment on combination
control valves (See Fig. 1 & 1A).
2. Defective combination control valve. 2. Replace valve.
Pilot outage 1. Dirt in pilot orifice. 1. Clean pilot orifice with air or solvent, do not ream.
2. Pilot lighter door open. 2. Close pilot lighter door.
3. Defective automatic pilot section in 3. Replace combination control valve.
combination control valve.
4. Defective thermocouple. 4. Replace thermocouple.
5. Vent safety shut off system. 5. See “Venting” section.
Pilot will not stay lit 1. Pilot flame too large or too small. 1. Re-adjust pilot flame using adjustment on combination
when control knob control valves (See Fig. 1 & 1A).
is released 2. Defective thermocouple. 2. Replace thermocouple.
3. Defective gas valve. 3. Replace gas valve.
4. Loosen connections at spill switch or 4. Tighten connections.
ECO on gas valve.
TROUBLE SHOOTING CHART - AUTOMATIC PILOT & VALVE
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