The display does not light up or display and codes. It had worked just fine the past couple of years with a new keypad. I ran it for 3 days while we had freezing temps, now nothing. The fuse looks good. What next?
Pentair Mastertemp 125 heater won't turn on.
- Thread starter rgodding
- Start date
- Jul 21, 2013
- 54,613
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Welcome to TFP.
Is your MasterTemp heater connected to any automation system or is it run by its control panel?
Have you checked the CB powering it?
Do you have a multimeter and know how to use it?
Is your MasterTemp heater connected to any automation system or is it run by its control panel?
Have you checked the CB powering it?
Do you have a multimeter and know how to use it?
Hello, thank you for your response. No automation, CB? It is wired to same 240 that the pump is on. Yes, i have a meter and know how to use it.
- Jul 21, 2013
- 54,613
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
CB = circuit breaker
Start tracing voltage in and out of the transformer.
Download the manual to get the wiring diagrams.
See if you have 24V at the board power connector.
You absolutely sure the fuse is good?
Start tracing voltage in and out of the transformer.
Download the manual to get the wiring diagrams.
See if you have 24V at the board power connector.
You absolutely sure the fuse is good?
ok, yes, CB is good. So just now, I was going to test for the 24 volts from the power supply to the board, got nothing, maybe was not testing it correctly... plugged it back in and it lit up and is working now......
- Dec 13, 2020
- 798
- Pool Size
- 19600
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Aquapure 1400
I had a similar episode with my MT heater. Connectors were intermittent. There were random malfunctions where wiggling one would get things going again. This was a 2-year old heater with connectors looking completely fine. Finally got it to be reliable (2+ years now, knock on wood) by pulling each connector apart, spraying with CRC contact cleaner, and re-plugging.
Last edited:
- Jul 21, 2013
- 54,613
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
DB-Cooper
Well-known member
- Jun 18, 2019
- 579
- Pool Size
- 30000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
It’s not well documented, but I believe MasterTemps have some sort of safety disable feature when water temps are cold. I believe they just completely shutdown if water temps are below 40. No panel, no response.
I remember in Feb 2021, I made a last ditch effort to save the pool and the heater wouldn’t turn on, water temps were in the 30s. I thought it was dead so when I had some pipes repaired and started the pool back up, I was happily surprised the heater turned on.
Curious about it, I actually tested on Wednesday, just turn on for one second to see. I couldn’t get any buttons to work, and automation wouldn’t fire it. After letting the water warm, I flipped the breaker and tried again and the panel lit up. Once I saw that, I shut it off.
I googled and found some pdf somewhere that said they won’t power/fire if water temps are below 40F.
Might just be waiting until things warm up.
I remember in Feb 2021, I made a last ditch effort to save the pool and the heater wouldn’t turn on, water temps were in the 30s. I thought it was dead so when I had some pipes repaired and started the pool back up, I was happily surprised the heater turned on.
Curious about it, I actually tested on Wednesday, just turn on for one second to see. I couldn’t get any buttons to work, and automation wouldn’t fire it. After letting the water warm, I flipped the breaker and tried again and the panel lit up. Once I saw that, I shut it off.
I googled and found some pdf somewhere that said they won’t power/fire if water temps are below 40F.
Might just be waiting until things warm up.
My pump does something like that, it'll only start up at 1000 rpm, but this heater had never done that in the almost 6 years that I've had it. Now having said that, it did it again. I had it shut off for about 18 hours and flipped the power on. The heater showed nothing until i opened it up and pulled the lead for the 24 volts to the keypad. Plugged in back in and the heater fired.
back to square one now.... unplugging and plugging the 24 volt lead to the board does nothing but give one flash of the led on the power supply
replaced the board and the transformer. transformer had no voltage coming out, no lights lit up at all. now i get the one flash on the led on the power supply when the 240v switch is flipped on, and that is it.
- Jul 21, 2013
- 54,613
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
- Jul 21, 2013
- 54,613
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
That is the Fenwal control module, not a power supply.
One flash indicates an Air Flow Fault.
Check the blower fan and if the power wires are properly connected.
www.troublefreepool.com
One flash indicates an Air Flow Fault.
Check the blower fan and if the power wires are properly connected.
Pentair MasterTemp Heaters - Further Reading
www.troublefreepool.com
ok... it should be, nothing had been disconnected. also, the lcd/keypad aren't lighting up at all.
- Jul 21, 2013
- 54,613
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60