Question about Hayward H-series Electronic Gas Pool Heater H400

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Clean heat exchanger

H400 heat exchanger heavily sooted

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It needs to be removed and power washed. This is not always a DIY project, unless you have a strong back and are mechanically inclined. The heavy sooting indicates that the heater is not getting enough gas. Remember bunsen burners? Same deal, we want a blue flame (non sooting), not an orange flame. The culprit is usually an undersized gas line to the heater, or a smaller gas meter than the heater requires.

Posted on Jan 05, 2013

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Check the condition of the heat exchanger. If it is heavily sooted from prior to adjusting gas pressure it will not vent properly. Check for downdrafting or blockage in the flue pipe if the heat exchanger is not sooted.

If the heat exchanger is sooted a good steam cleaning or even a trip to a car wash should remove enough soot for it to return to operating normally.

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This is a code for what is called a prover switch. What it is a circut for the air pressures. Depending on model you can have one or two of these. Their will always be one for the exaust perssure and this will often be the culpret. If the sensor is good a sooted exchanger, rat nests on the exchanger or in the exaust can cause this. If you have a second switch it will be for burner air pressure and you will look for the same problems only inside the burner cabnet. Good luck, I'm sorry I can't be more help. But at least you know to look to the vent system.

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Soot on your heat exchanger would explain this. Or leaves or rat nests would do the same thing. You can clean these yourself or get a repairman to do this for you. Just be sure if you have soot on the exchanger use a stiff bristel brush but not a wire brush. The soot as you free it up will be pouder and can explode in a fashion. Be careful and good luck.

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