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I am wondering how to add surge protection for newer VSP. Main Panel full with many tandem breakers. 30A pool sub panel takeoff in main panel. Pool subpanel has 20A breaker for pump/heater, 20A breaker for spa air blower and 15A SP breaker for pool lights/ GFCI outlets. Square D HOM HEDP seems...

May be a question of semantics. Does it turn off right after starting (short cycling) or off before it reaches the set temperature? This should be the installation guide for your unit https://hayward-pool-assets.com/assets/documents/pools/pdf/manuals/HeatPro-Installation-HP2xxxxT-HP2xxxxBT.pdf...

Frontside and backside are not proper nomenclature for regulators and gas valves, so it is hard to tell exactly what you are talking about (frontside/backside???). The regulator and gas valve are designated with "inlet" and "outlet". The proper hookup of the manometer to the gas valve to check...

You might try finding a NATE certified contractor in your area https://natex.org/homeowner/find-a-contractor-with-nate-certified-technicians/find-a-contractor-with-nate-certified-technicians although not all HVAC contractors are willing to work on pool heaters.

It is an open circuit if the heater is not turned on and will have no effect on the pilot. The only thing in the circuit with the heater off is the magnetic pilot safety.

The connections at TP and TP/TH that the thermopile is connected to also connect inside the gas valve to the magnetic pilot safety. You could try cleaning up the gas valve terminals and wiring connections to see if that makes a difference. If not it would indicate that the gas valve needs to be...

There is no need to disconnect thermopile leads from the gas valve. Thermopile out put can be read from TP to TH/TP when you are attempting to light the pilot. You state that you are getting 600mv when you are attempting to light the pilot. Does the pilot stay lit when you let up on the gas...

As I understand it you have 600mv measured at the 2 leads from the thermopile, presumably at TP and TH/TP on the gas valve with a 2 lead thermopile. When you let up on the knob on the gas valve in the pilot position, the pilot stays lit ( the magnetic pilot safety engages ). When you try to...

Overfiring can be caused by incorrect orifices or incorrect gas pressure to the burners from the gas valve regulator. Partial rollout ( not enough to trip the rollout switch { fusible link} ) can be caused by a partial blockage of the heat exchanger or incorrect gas/air mixture. Noticed that the...

Even though the thermopile may be good the output is in millivolts (very low voltage). The output from the thermopile has to go through all of the safeties before reaching the gas valve. What is the voltage in millivolts at the gas valve? Any deterioration of any of the safety contacts will drop...

During the heater attempting to start up, do you have 24 volts between the "GND" terminal and the "PS" terminal on the Fenwal after the blower starts up? That is what initiates the power to the ignitor for it to heat up.

That does not appear to be caused by the ignitor. The ignitor is not powered constantly. I would think it was caused either by overfiring (excessive heat) or or partial flame rollout (poor flame pattern).

When I lived in Scottsdale, a BAD winter was one with more than 2 "frosts" !!! Of course in the Summer, both faucets give "hot" water!!!

This should be the manual for your heater if you don't have it https://www.hayward-pool.ca/assets/documents/poolscanada/pdf/manuals/universal-h-series-service-and-installation-manual.pdf . The heater needs a thorough cleaning and inspection. Looking to clean out debris and inspect for...

Photos of the entire heater and also with the panel off would be helpful as different styles of Hayward H heaters sometimes use an induced draft blower or a combustion air blower. Also the full model number on the heater. Do you have a multimeter and feel both safe and comfortable using it?

Just drained and refilled pool to lower salt level and TDS from years of liquid chlorine and evaporation with high hardness fill water. Have been bringing chemicals up to correct levels. Currently FC 5.5 (evening), PH 7.8, TA 90, CH 250 and CYA 50. Height of summer here in Las Vegas and I have...

It does not matter in what order they are connected. It is just 2 safeties connected in one continuous loop, if either safety opens it will break the circuit as intended. Sorry for delay as I have been fishing in Canada.

You got lucky with your observation and with a responsible and honest pool guy!

LP orifices are smaller than NG orifices. LP pressures are higher than NG pressures. LP contains ~ 2 1/2 times the BTUs of NG per cubic ft. Obviously the heater was overfired for 1/2 Hr.(by how much?). I would insist on replacement with a new LP heater. Somewhat surprised that it would run for...

A pool heater is basically an open loop boiler (no expansion tank) and this type of system has been used in the past (I am dating myself here) where an open tank similar to a toilet tank was placed at the highest point in the system to absorb the differing volumes of water ( a noncompressible)...

Finding a qualified service technician for a pool heater is not always easy. Many HVAC companies do not want to work on them because they are not familiar with them and many of the parts are not available at HVAC parts suppliers. Not all pool service technicians are familiar with heating...

Yellow is an indication of insufficient air to support a solid blue flame. It also produces both soot and carbon monoxide. Most probable cause is dirt/corrosion in the pilot orifice and or burners (depends on which flame is yellow). A thorough cleaning by a qualified service tech would be...

Gas valves will not move from "on" to "off" by themselves. Older systems that used a continuous (standing) pilot had safeties that would not allow the gas valve to open if a pilot flame was not present. Newer systems with an intermittent pilot/spark ignition use flame rectification to confirm...

Continuity of the ignition cable is from the rod (electrode/sparker) to the connector at the other and of the ignition cable. Continuity of the ground wire is from the pronged pilot hood to case ground with the pilot assembly in place.

The ignition cable only has continuity to ground when there is a flame present. The flow of electricity is through the flame.

From the pressures that you are reporting it seems that the heater is LP rather than Natural Gas. Pressures should be taken on both sides of the gas valve, both static and dynamic at the same time. Also both sides of the regulator to determine if you have a problem with the regulator or low tank...

TY... will keep an eye on it.