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Finally felt up to crawling under the deck to work on the heater again. This has had me baffled since opening up the pool this Spring also. Checked the continuity across the operating/safety circuit with connections removed at TH/TP to TH, read 0.00 ohms little bouncing with some low...

Thinking about the operating/safety circuit, if all the components are in good working order, this circuit is just a jumper wire between the TP/TH and TH connection when the demand for heat is there. If I were to disconnect this circuit and put a jumper wire across these connections, TP/TH to...

Thanks. The one I found was $418 on Amazon. Was looking for an alternative equivalent that would work. Is the Pentair gas valve any different then those used for hot water tanks providing the specs are the same?

After looking at the direct replacement from Pentair, is there an alternative gas valve that is available for less that will do the same thing?

Thank you.

I am at a loss to explain why my readings are so inconsistent each time I go out to take measurements. It doesn't help in trying to figure out what's going on. Here are the measurements from today. Voltage from thermopile disconnected from valve - 630 mv Voltage at valve TP/TH and TP - 476 mv...

I have the red wire from the thermopile connected at TP and the white wire to the TP/TH. I removed the red wire at TP and the wire from TH. The resistance between TP and TH is 2.3 ohms. What should it be?

I did replace the thermopile several weeks ago and it's putting out 632 mv. The pilot flame is a steady, solid blue (photo below). A diagram of the operating/safety circuit with mv measurements from TP to all components is also below. The differences in voltages maybe from my VOM meter...

Appreciate your patience. With the heater installed and pressure switch closed I am getting 519 mv at the TP-TH to TP connection of the thermopile to the gas valve with no demand for heat. When the thermostat is rotated to demand heating the voltage drops to 479 mv. The TP to TH is 231 mv...

I can't explain the 415 mv reading in my previous post so I went back, installed the heater and measured again. Should I be getting the same mv reading of 526 mv across all the components in the safety circuit? What mv value is needed to open the gas valve?

Thanks for getting back. Here are my measurements: TP to: TP-TH 526 mv Hi Limit 513 mv Press Sw 515 mv On/Off 515 mv Temp Cont 515 mv I cleaned all connections. When pilot was lit took about 20 minutes for thermopile to level out at 525 mv.

Here are the mv readings Photo 1 mv from thermopile, pilot lit 527 mv Photo 2 mv to TP-TH no heat demand 16 mv Photo 3 mv to TP-TH when thermostat in heat demand mode 112 mv. I hope I have the correct connections and units.

When measured at the connection of the thermopile leads to the gas valve it's 545 mv. If 600+ is needed could the thermopile be bad?

I have a Pentair Minimax 100, natural gas, pool heater. The pilot will light and stay lit but when the thermostat is turned to demand heat the burner doesn't ignite. I have 545 mv from the thermopile and have continuity through the circuit to the valve when heat is demanded. Is 545 mv enough...