| 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 |
