Is this heater standalone, or is it hooked up to an external controller? If it is standalone, it sounds like you need a water temp sensor for the heater. If its hooked up to an external controller, you likely need a 10k temp sensor. What error code does the heater display when it shuts down? And what temperature are you able to read on the heater and/or external controller?
SOURCE: Hauward H400 heater won't turn on
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
SOURCE: Hayward H400 Pool heater will not stay lit
"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.
SOURCE: my plumber needs manual for Hayward #H400 FDP
The P at the end stans for propane...the manual found here is for the H400FD series natural gas or propane.
John
SOURCE: hayward H400 error code bo
This error means "Bypass Operation". On the back of the control module there are some "dip switches". They have an on or off position. Check switch number 2. Make sure it is in the "off" position. The "on" position is for a remote thermostat.
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