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38 High Efficiency Propeller Fan Gas Unit Heater • GHND-SVX01A-EN
Trouble Shooting
3. Drafts around heater.
4. Negative pressure in building.
5. Blocked flue collector.
CORRECTIVE ACTION
• Inspect all gas piping and repair.
• Clean heat exchanger/flue.
• Eliminate drafts. Refer to “Installation”.
• See “Installation”.
• Clean flue collector.
G. Delayed ignition.
POSSIBLE CAUSE(S)
1. Excessive primary air.
2. Main burner ports clogged near pilot.
3. Pressure regulator set too low.
4. Pilot decreases in size when main burners come on.
5. Pilot flame too small.
6. Drafts around heater.
7. Improper venting.
CORRECTIVE ACTION
• Close air shutter. Refer to “Operation".
• Clean main burner ports.
• Reset manifold pressure. Refer to “Operation”.
• Supply piping is inadequately sized. Refer to “Installation”.
• Clean pilot orifice. Refer to “Operation”.
• Refer to “Installation”.
H. Failure to Ignite.
POSSIBLE CAUSE(S)
1. Main gas off.
2. Lack of power at unit.
3. Thermostat not calling for heat.
4. Defective limit switch.
5. Improper thermostat or transformer wiring at gas valve.
6. Defective gas valve.