Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1
A thermocouple or thermopile or pilot generator (these are all the same) does not monitor 'Temperature' of the heater and does not communicate with the heater to tell it how hot it got the water!
The purpose of the Thermopile is to sense a pilot flame, generate enough electricity (Milivolts) to operate the functions of the gas valve, thermostat, pressure switch and misc hi - limits.
If not enough electricity is generated, heater won't function. If no flame to consume the pilot fuel, which you manually have to hold down until it gets hot enough, the pilot valve will automatically stay open, and you can let go of manual button. Pilot remains lit = communicating to heaters gas valve: "There's a flame consuming the gas, it's okay to keep it open". Now you turn the manual gas valve knob from Pilot to On. Again communication from thermopile to gas valve, and gas valve will confirm: "My valve is now turned to ON, Hey thermopile is there still a flame? Yep! Okay then, since there still a flame at pilot burner to consume the main burner fuel, I'm going to open it! Is that okay? Yep! Okay here goes".
Heater will then fire up, if all systems go.
Now the heater is set to 100° the THERMOSTAT, will monitor the temperature and will tell the heater to turn off when it has been reached. Actually realistically, the thermostat turns the heater off by opening its circuit when desired temp has been met.
If water flow is drastically reduced or dramatically restricted, the outlet water flow will be EXCESSIVELY overheated! This will melt outlet pipes. The Unitherm governor may have failed. If there is a bypass valve installed it may have been left open, which in turn is diminishing proper water flow. = problem.
Check for anything that is restricting water flow.
Note*** water pressure that seems adequate - is not good diagnostics and it does not =, or is not the same as, good water flow.
Posted on Jun 03, 2015
Your thermopile that tells the heater how hot the water is has failed. It should kill the heat at a temperature of 104f. This also indicates that the limits are not doing their job, as they should be killing the heat at 135f (low limit) or 150f (high limit). Schedule 40 pvc is rated at about 140f.
This many failures at once is rare, and typically indicates that the heater has been rigged. Get a tech out to fix it correctly. You are literally playing with fire.
Posted on Nov 30, 2013
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Posted on Jan 02, 2017
if means ignition failure check that gas is on, check for fauilty igniter wiring or connections, inspect gas valve wiring measure voltage across gas valve during trial to ignition if 24 volt replace gas valve if no 24 volt replace control module
Posted on May 19, 2009
check pressure switch operation most heaters will not operate without sufficient water flow/pressure. You can use a multimeter to troubleshoot the wiring using the schematic. If its induced draft milivolt ignition verify there is suffiecient gas flow to the unit
Posted on May 26, 2009
Poor flow, try cleaning the filter. If it is a cartridge, try a brand new element. Next would be to inspect the bypass in the header to ensure it is sound.
Posted on Jun 12, 2009
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.
Posted on Dec 18, 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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