Question about Lochinvar ENERGY RITE 399000 BTU PROPANE GAS POOL HEATER

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I have a Lochinvar pool heater that on the dispaly is showing Air Pressure Switch Open. I looked at the manual and it talks about air flow from the supply vent and exhaust vent. Than it says about combustion chamber prassure. Is this a common problem or do i possibly have a defective Pressure Switch

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Hi and welcome to FixYa, I am Kelly.

Try this before taking anything apart to far:

The pressure switch is located in the front header, behind the

upper side jacket panel, above the water connections. When

required, the pressure switch can be reset with the following

procedure:

1. Clean filter and skimmer.

2. Start filter pump.

3. Set digital thermostat to highest setting.

4. Turn the adjustment knob on the pressure switch clockwise

until the combustion air fan in the front control panel turns

off. Fan will not turn off if system pressure exceeds 5 PSI.

5. Slowly turn the adjustment knob counter-clockwise until the

combustion air fan turns on. Turn knob an additional ¼ turn

counter-clockwise.

6. Turn filter pump off and on several times. The heater should

shut down immediately when the pump stops.

7. If the heater does not shut down immediately as the filter

pump stops, repeat steps 4, 5 and 6 until proper operation

is achieved.
8. Reset thermostat to desired temperature setting.

If after doing all of the above you still have the problem.... you can remove the switch and check for debris in the water passages. If you find debris remove it, reinstall the switch and repeat steps above.

- Still have the problem... Replace the switch.

Thanks for choosing FixYa,
Kelly

Posted on Mar 21, 2011

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