Problem: Heater Will Not Come On
| Possible Cause | Remedy |
| Automatic ignition system fails | Check if electrical connections are correct and securely fastened. If “Yes,” call for service. |
| Millivolt ignition fails | Check to see if pilot is lit. If not, refer to “Operating Lighting Instruction” – Millivolt. |
| Pump not running | Check that pump is turned on. |
| Pump air locked | Check for leaks. |
| Filter is dirty | Clean filter. |
| Pump strainer is clogged | Clean strainer. |
| Defective wiring or connection | Call for service to repair or replace wires. |
| Defective pressure switch | Call for service to replace switch. |
| Defective gas controls | Call for service to repair controls. |
| On/Off Switch in “Off” Position | Turn switch to “Pool” or “On” position. |
Problem: Heater Short Cycling (Rapid On/Off Operation)
| Possible Cause | Remedy |
| Insufficient water flow | Clean filter and pump strainer. |
| Defective wiring | Call for service to repair or replace wires. |
| Defective flow valve or out of adjustment | Call for service. |
| Defective hi-limit switch or thermostat | Call for service. |