Hayward heater not heating

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jly62

Member
May 27, 2024
12
Central Indiana
We have a Hayward H200FDN pool heater that worked perfectly before closing last Fall. Now we can not get it to start heating. We have:
Made sure gas is on
Cleaned all firing orifaces/manifold
Tested the igniter
Tested voltage to the gas valve

The fan comes on, then the inductor, then the igniter, but everything stops at the gas valve. My first question is this, our voltmeter reads 23.8 volts, so it doesn’t quite get up to 24V. Is that enough to make a difference?
If not, then is there a way to test the valve solenoid, or do we just replace the valve?
 
23.8V should be fine for the gas valve.

Check the resistance of the gas valve coil.

Do you hear the gas valve click open?

@swamprat69 may have ideas
 
jly62 said:
We have a Hayward H200FDN pool heater that worked perfectly before closing last Fall. Now we can not get it to start heating. We have:
Made sure gas is on
Cleaned all firing orifaces/manifold
Tested the igniter
Tested voltage to the gas valve

The fan comes on, then the inductor, then the igniter, but everything stops at the gas valve. My first question is this, our voltmeter reads 23.8 volts, so it doesn’t quite get up to 24V. Is that enough to make a difference?
If not, then is there a way to test the valve solenoid, or do we just replace the valve?
Click to expand...
For how long do you measure that voltage at the main valve? How long does it stay at 23.8? If less than 3 seconds (literally 3 seconds), one of the boards is bad. You don't ever open a gas valve unless you're just curious and then want to throw it a way.
 
You could check the resisitance of the gas valve solenoid coil(s). Resistance should equal voltage divided by amps (measured or rated on the gas valve label). If amps are measured with a meter, amperage above the rated amps on the label would indicate a stuck solenoid that is not pulling in. Most meters will measure up to 10A when placed in series with the gas valve wiring. Clamp style ammeter may need more than one turn of the wiring through the clamp to accurately measure the amps when divided by number of turns through the clamp when the amperage is fractional or very small.
 
jly62 said:
We hear a click when we get the voltage reading, not certain it’s the valve I guess. Does the valve have to be taken apart the access the coils to test them?
Click to expand...
If the valve clicks when voltage is applied it is most likely good. That's the sound of it opening. Its how long it is open that may be the issue. See my other post.
 
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Are you sure that you are getting gas to/thru the gas valve (do you smell gas at the vent exit during the attempted firing)? My 18 year old Hayward is also pretty picky about having clean burners when attempting to fire up.
 
Well, this is amazing… while we were asleep last night, I believe God put his hand on us and started the heater! After I posted here, we literally just put it all back together and put the panel back on and were resigned to have to replace the valve. This morning when I let my dogs out, I heard that familiar roar and saw steam rising from the vents! Sure enough, it’s running and the water temperature is rising!
So thank you everyone for your suggestions, but He took care of it for us!,😁
 
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