Lite2™

1. Low primary air. Correct manifold pressure according to rating plate. Correct orifice size if necessary (see parts list). Clean burner ports if dirty.

1. Blocked flue. Remove blockage.
2. Pilot out of position (delayed ignition). Correct pilot position.
3. Blocked heat exchanger. Clean and correct as necessary.
4. Refractory blanket out of place. Correct or replace blanket as necessary.
5. Altered draft hood. Install factory-provided draft hood

1. Low water temperature. Flue product moisture will condense at the start-up until the heater water temperature reaches the normal operating conditions.

1. Inadequate water flow through heater. Check temperature rise between inlet and outlet heater piping. See section 7.6 for recommended range of temperature rise. If temperature rise is above the maximum recommended, increase pipe size or pump capacity or locate obstruction. Check for closed valve in system.

1. Low water flow through heater. Increase size of pump or increase piping size.
2. Failing hi-limit switch. Check High limit switches and replace if necessary.

1. No power to heater. Check circuit breakers and power source.
2. Heater not grounded correctly. Check ground wire connection.
3. Broken or faulty hot surface igniter. Replace hot surface igniter.
4. Faulty ignition control. Replace ignition control.

1. Gas valve not at “on” position. Turn knob to “on” position.
2. Hi-limit switches failed. Investigate reason for overheating and replace hi-limit switch as necessary.
3. Pressure switch failed or out of adjustment. Adjust pressure switch or replace as necessary.
4. Fusible link failed. Investigate reason for flame rollout and replace fusible link as necessary.
5. Gas valve failed. Check and replace gas valve as necessary.
6. Broken wire in thermostat circuit or defective thermostat. Check continuity through thermostat circuit with wires disconnected.

1. Inadequate gas supply. Gas meter too small. Gas line from meter to heater too small.
2. Low manifold gas pressure. Gas pressure on heater manifold, should be adjusted to 4.0"W.C. for natural gas, 9.0" W.C. for propane.
3. Heater size inadequate. Replace with heater of higher output.

1. Gas valve not at “on” position. Turn knob to “on” position.
2. Hi-limit switches failed. Investigate reason for overheating and replace hi-limit switch as necessary.
3. Pressure switch failed or out of adjustment. Adjust pressure switch or replace if necessary.
4. Fusible link failed. Investigate reason for flame rollout and replace fusible link if necessary.
5. Gas valve failed. Check and replace gas valve as necessary.
6. Broken wire in thermostat circuit or defective thermostat. Check for continuity of the thermostat with wires disconnected.
7. Heater wired incorrectly. Check heater wiring against wiring diagram in heater, correct as necessary.

1. Inlet gas pressure may be too low. Consult gas utility company. Inlet gas pressure to heater should be 5.5" to 10.0" water column on natural gas. 10.0" to 14.0" on propane gas.
2. Inlet gas pressure too high causing an unstable blowing pilot. Pressure should be regulated within limits shown above.
3. Weak or defective thermocouple. Replace thermocouple.
4. Damaged pilot or thermocouple. Replace.
5. Dirty pilot. Blow dust or lint out of pilot.
6. Plugged or undersized pilot orifice. Clean or replace pilot orifice.

1. Restriction in water flow system at or downstream of heater.
2. Check for proper operation of all valves, bypass valve and any equipment between pool or spa and heater outlet.

1. Cold chimney. Allow heater to operate 5 minutes to create draft action.
2. Vent pipe pitches down to chimney. Reinstall vent pipe to pitch up from heater to chimney.
3. Blocked chimney. Remove blockage.
4. Draft hood altered. Install factory-provided draft hood.
5. Prefabricated chimney with incorrect cap. Install U.L. listed vent cap.