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GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 39
Trouble Shooting
7. Defective thermostat.
8. Defective transformer.
9. Loose wiring.
10. Defective ignition control.
CORRECTIVE ACTION
• Open all manual gas valves.
• Replace fuse or turn on power supply.
• Turn up thermostat.
• Check limit switch with continuity tester. If open, replace limit switch.
• Check wiring per diagrams.
• Replace gas valve.
• Check thermostat and replace if defective.
• Be sure 115 volts is supplied to the transformer primary, then check for 24 volts at
secondary terminal before replacing.
• Check and tighten all wiring connections per diagrams.
• Replace, if necessary. Also see W, X & Y symptoms.
J. Condensation of water vapor.
POSSIBLE CAUSE(S)
1. Improper venting.
CORRECTIVE ACTION
• Refer to “Installation, Venting”.
K. Burner won't turn off.
POSSIBLE CAUSE(S)
1. Poor thermostat location.
2. Defective thermostat.
3. Improper thermostat or transformer former wiring at gas valve.
4. Short circuit.
5. Defective or sticking gas valve.
6. Excessive gas supply pressure.
CORRECTIVE ACTION
• Relocate thermostat away from drafts.
• Replace thermostat.
• Check wiring per diagrams.