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Sorry, have been out of town for a family reunion for the last 2 weeks. Your reported mv measurements do not seem to make any sense. Your previous 3 photos clearly show that you are dropping 415 mv from TP to TH. Are you now showing 515mv from TP to both sides of the Temp control and also from...

This should be the manual for your heater https://www.pentair.com/content/dam/extranet/nam/pentair-pool/residential/manuals/training/MiniMax%2075-100%20Owners%20Manual.pdf Wiring diagram for millivolt is on page 20. It seems that you are dropping more than 400 mv across your...

What is the mv reading from TP to TH?

As to cost, you will probably be charged for filter/driers, refrigerant and labor. This can add up to a significant amount! Get the costs before giving an OK to the compressor replacement and weigh it against the cost of a new heat pump. If you replace the heat pump keep the old unit for its parts.

Like I mentioned a compressor replacement on a burnout is tricky and somewhat difficult especially on a heat pump. What has happened is that the compressor motor windings have shorted and burnt up the copper windings insulation, leaving debris and possibly acid in the closed system. If possible...

Sounds like a compressor problem. There should be a difference between L1 to L2 and L2 to L3 and L1 to L3 should add up to the total of the two. Looks like shorted compressor windings. How old is the heater? Compressor warranty is usually either 5 or 10 years, but may not include labor and other...

When the cutout did pull in, did the compressor make any noise such as a short 2-3 sec hum?

If the cutout did pull in, did the compressor start or just the fan? If just the fan, measure resistance from L1 to L2, L1 to L3 and L2 to L3 and also measure resistance from L1 to ground, L2 to ground and L3 to ground. You can do this with the power OFF.

Great! On the "TBL" connection strip #1 and #2 should be your 24V into the circuit board with #1 being 24V ground. You should measure 24V between #1 and #2. If the heater is calling for heat, you should also measure 24V between #1 and all subsequent #s up to #8. If so, you should also measure...

The little cutout with the black square in the middle of the contactor is flush with the face of the contactor which means that the contactor is not powered/pulled in. The black square will depress when the contactor pulls in. This should be the manual for your heater...

I do not see any power wiring at that contactor. Is that the auxiliary contactor for the "pump/filter"? The wiring diagram shows the compressor contactor as a 3 pole contactor with L1,L2,L3 and T1,T2,T3

Is the compressor contactor closing and pulling in? Do you have 24 volts across the contactor coil?

Are you even getting 24 volts to your safety switches? Another way to check is to measure voltage from #15 to #10, 9. 8, 7, 6, and 5. If the control board is asking for heat and you have 24V into the control board you should show 24 volts in each measurement.

Easiest way to check a closed or open switch that operates with 24 volts is to measure voltage across the switch when it is supposed to be operating (closed). If you read 0 volts it is closed and if you read 24V it is open (if you have both 24V out from the transformer secondary and 24V at then...

How does your whole system for the pool equipment operate? Do you have automation or not? You are telling me that you have 24V from 15 to 17 at the control board for the heater. Do you also have 12V between 15 and 16 on the control board? Do you have an active display on the heater? The wiring...

A dual mode heat pump for both heating and cooling uses a reversing valve to switch between heating and cooling modes. If the reversing valve is stuck or not powered correctly ( depends on which mode is considered a priority for powered/not powered ) it will only work for the position the...

How old is the heat pump? If jumping out the LP switch starts the heater it would seem that you are low on refrigerant. Look for any oil spots on or near the refrigerant lines which would indicate a refrigerant leak. Is the heater still under warranty? When you say you jumped out the LP...

You have no signature filled out. What make and model pool heater do you have? List other pool equipment that you have.

Slight corrosion around the heat exchanger pipes with no water leaking from the heat exchanger would not cause an IF code nor be a reason to replace the heat exchanger on a 4 yr. old heater. Sounds like he is just pushing for an unneeded sale. Your heater may just need to be cleaned and checked...

I am not familiar with the gas valve that is used in the heater, but this seems to be it 100441 VS8820A Honeywell Gas Valve 3/4"NPT Gn 0.75V - Valve Do you have the original manual for your heater? The 2 yellow wires at the gas valve are for an auxiliary safety for the powerpile...

This might be close to the manual for your heater https://www.parts4heating.com/v/vspfiles/images/pdfs/ESGSeries2.pdf It is a millivolt heater. Is the pilot lit? You seem to have excessive corrosion by the gas valve, gas manifold and electrical connections. Are you by the ocean? What...

Sounds as if the compressor is trying to start, but isn't starting. It could be a failed capacitor. If the compressor tries to start but doesn't, it will draw 5-6 times the normal running amps and overheat until it trips the comnpressor internal overload. This heat is cumulative every time the...

Not sure exactly what is correct and applicable on this list but it is a starting point. You might want to check here with someone more knowledgeable about parts. Jandy Lite 2 header gaskets R0050800 - Google Search

This should be the manual for your heater https://www.mypool.com/Help-Files/Jandy-LG-Heaters.pdf Those look like heat exchanger baffles which are listed on page 35 of the manual and displayed on page 87 as (#84). You should notice that the longer part of the width is curved to fit...

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.

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...

It also looks like the bulb/probe should fit in a well. The well should be a metal well. Is there a temperature conductive paste in the well to assure good heat transfer from the well to the bulb such as this Amazon.com ?

Is this the error message that you are seeing ( H2O Sensor Fail Water temperature sensor is OPEN or SHORTED. Replace Water Temperature sensor ) ? Have you checked with a meter to confirm that the sensor is open or shorted?

So at step 13 you get all NO answers = "replace ignition control" and since you read no resitance at the gas valve terminals you will also have to replace the gas valve. If you do so, I would suggest that you install the Fenwal without the gas valve wires attached (Brown {13} & yellow at the...

Just trying to understand how it happened