Heater
| Possible Cause | Remedy |
| Heater will not come on | |
| Automatic ignition system fails | Check if electrical connections are correct and securely fastened - if YES, call service person. |
| Pump not running | Place pump in operation |
| Pump air locked | Check for leaks |
| Filter dirty | Clean filter |
| Pump strainer clogged | Clean strainer |
| Defective wiring and connection | Repair or replace wires |
| Defective pressure switch | Replace switch |
| Defective gas controls | Call service person |
| On-Off switch in "OFF" position | Turn switch "ON" |
| Heater Short Cycling (Rapid On & Off Operation) | |
| Insufficient water flow | Clean filter and pump strainer |
| Defective wiring | Repair or replace wiring |
| Defective flow valve or out of adjustment | Call service person |
| Defective hi-limit and/ or thermostat | Call service person |
| Heater makes knocking noises, Make sure all valves on system are open | |
| Heater operating after pump has shut off | Shut off gas supply and call service person |
| Heater exchanger scaled | Shut off gas supply and call service person |
Troubleshooting
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