I have a master temp 400 that has no power due to the easy touch control system not giving it power. (Fireman switch) I figured that much out so far. Both temperature sensors for my pool and spa are reading 188° in the middle of winter. Could they both have gone bad at the same time? Should I replace them or is there something else that I'm missing? Would the high temperature be what's preventing the heater from being turned on?
Mastertemp 400 bad temp sensors?
- Thread starter Ffjmoore
- Start date
- Jul 21, 2013
- 65,062
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
- Jul 21, 2013
- 65,062
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Connect a 10K resistor in place of the water sensor. If it reads the temperature as 76F then its the sensor if not then its the board.
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Temperature Sensors - Further Reading
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Pentair MasterTemp Heaters - Further Reading
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- Jul 21, 2013
- 65,062
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
You can test the temperature sensors using a multimeter and see what resistance it is reporting to the board.
- Jul 21, 2013
- 65,062
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Check the wires on the temperature sensors as 188 is a low resistance and could indicate damaged and shorted wires.
There is probably only one sensor for both.
In Pool Mode, it reads as Pool Temp.
In Spa Mode, it reads as Spa Temp.
Can you show the system?
I will measure the resistance on them. You guys rock. I'll report back.
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Ok, water sensor ohms 1.012k and air is 18.41k.
Does that confirm bad water temp sensor?
Does that confirm bad water temp sensor?
The system comes with three sensors (Air, Water and Solar), so you should have an extra one.
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Note that the temp is labeled as resistance in kiloohms in this interactive graph.
The top number is resistance in kiloohms and the bottom number is the temp in degrees F.
Below shows 10.5 k ohm at 75 F.
Need to get Claude to fix.
Here is a calculator you can use to enter a Temperature and get resistance or enter a resistance and get temperature.