Question about Hayward H-series Electronic Gas Pool Heater H400
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Posted on Jan 02, 2017
SOURCE: MH 18 B wont stay lit
sounds like you have a limit safety issue, the unit is over heating and kicking out on high limit, or the limit is weak, either way you should look into replacing the limit, hope that helps
Posted on Jan 20, 2009
SOURCE: Hayward H400 heater problem
depending on your model- you may have to reset it after fixing it. I backwashed mine, had the same LO error code. I pushed "mode" through all the cycles (spa, pool, etc. then back to pool) and it started right up. (I hadn't noticed it but it told me to on the heater below where it told me the various error codes...referred to it as "lock out"). Saved a service call.
Posted on May 10, 2009
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.
Posted on Dec 29, 2009
"IF" - Hayward Pool Heater Fails to Ignite: the most common reason for this problem is insufficient gas supply. The Hayward heater LED display will show a diagnostic fault code of "IF" which stands for Ignition Failure. Undetected gas pressure problems if not investigated properly may result in unnecessary replacement and servicing of your Hayward Pool Heater.
Posted on Apr 23, 2010
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