If the heater is operational, working and the top of the heater is hot, and you do hear the combustion of the gas, see flames in the burner tray area...
.... then your heater is heating the water!
If there are flames in the heater, the heater is normally doing its job. Most people are not aware of the time it takes to see a "Temperature Rise". The average temperature rise is dependent on your heater size, the ambient temperature of the time of day you would like to use your heater, the wind/breeze factor as it goes over your pool surface. Is the pool waters surface covered? etc. All of this is a factor on how quick the temperature will rise. It is possible that you will not feel warm water coming from a return fitting.
Another common mistake some pool owners make is the system is on a timer. And the desire to start the initial warming of the water starts with the flick of the heater switch and then a few hours later the pump turns off and along with it, the heater. The heater will only work, if the pump is on and circulating the water! No circulation, no heat! So if you have a timer, remove the "Off" timer pins and allow the heater to work.
SOURCE: hayward h100ID ignitor not starting
There are many different things it could be with the fan comming on that means the heater is trying to fire. Make sure gas supply is on first of all. Depending on the gas line run you may have to try several times of turning on and off the heater to reprome the line. If no luck with that the next step is the igniter follow the small tube comming off the gas valve and folliw it to the burner tray try poking a small peice of wire through it from a wire brush it probally is plugged. Heater should fire after that.
SOURCE: Hayward pool heater H100ID keeps blowing GFI
First, I don't see any heaters in my parts wired thru a GFCI. Why did you resolder inputs on board. Usually, those are not repairs that are acceptable. If the pins have shorted, then you need to replace the board. Could be a problem with the ignitor, but this might be one that you will need to call a pro in for. Did you install the heater yourself???
SOURCE: I have a hayward H100ID above ground pool heater.
low water flow is making the heater knock, (PULSATE) clean filter or backwash, check pump and skimmer baskets and empty. if still low flow and knocking, check impeller on pool pump to make sure it isnt clogged.
There are several things that can cause this symptom. If you have a volt/ohm meter and call the Hayward technical support at 908-355-7995
they might be able to help you figure this issue out. I hope this helps.
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