Mastertemp E05 error code

[easy-e]

Hey all. Have a brand new Mastertemp 400, install in June. Getting E05 error code. After doing my own research and consulting manual it looks like the code is for a bad/faulty stack flue sensor. Exhaust temps support that, jumping from 40 up to high temps which makes no sense. Heater runs for a minute or so before it shuts off and flashes E05 code.

Opened the heater up and took a look at the sensor. Seems intact except for the point where the two wires enter the “sensor” (we are getting past what I really understand here) are frayed and exposed. I’m no electrician but seems like this would be an issue and looks different from the new ones I see online (ordered). Hard to get a picture though.

Thoughts on cause of this? Critter? Bad install?

 

[ajw22]

I have not looked that closely at the SFS but that exposed wires does look wrong. I have seen a lot of bad stuff getting through manufacturers quality control lately.

See how the replacement you have ordered looks and works.

 

[easy-e]

I have not looked that closely at the SFS but that exposed wires does look wrong. I have seen a lot of bad stuff getting through manufacturers quality control lately.

See how the replacement you have ordered looks and works.

Yeah, I mean it ran all summer so I’m not sure what happened but I didn’t think it looked right. Part arrives Monday so we shall see.

 

[nikolausp]

Yeah, I mean it ran all summer so I’m not sure what happened but I didn’t think it looked right. Part arrives Monday so we shall see.

What a coincidence. I had this same problem on Saturday, and my new sensor arrives today as well (Monday)...I'm still waiting on it to arrive. Let's hope it works for both of us!

 

[easy-e]

What a coincidence. I had this same problem on Saturday, and my new sensor arrives today as well (Monday)...I'm still waiting on it to arrive. Let's hope it works for both of us!

It was the sensor. Easy fix at least.

 

[JoyfulNoise]

Any evidence of rodents? Rodents LOVE to chew on insulation. It’s like Cheetos to them.

 

[nikolausp]

It was the sensor. Easy fix at least.

I replaced my Stack Flue Sensor yesterday, and now my heater works as it should again! Yay!

 

[kul]

I had a similar issue last winter and it was the SFS. Rodents were the culprit so I added wire mesh on all entry points to prevent another attack.

 

[JamesW]

 

[nikolausp]

I had a similar issue last winter and it was the SFS. Rodents were the culprit so I added wire mesh on all entry points to prevent another attack.

Did you wire mesh the black exhaust somehow? I installed the wire mesh kit on my MasterTemp also, but it had nothing for the black exhaust thingy that has lots of holes

 

[kul]

I didn’t wire mesh the area that the exhaust comes out of, but all surrounding area around the exhaust is wire meshed. I purchased the kit from this site: MK Rat Proofing

 

[nikolausp]

I didn’t wire mesh the area that the exhaust comes out of, but all surrounding area around the exhaust is wire meshed. I purchased the kit from this site: MK Rat Proofing

Yup , That's the kit I bought when my pool got built. My heater looked pretty clean on the inside when I peaked inside yesterday. There's definitely holes in the exhaust, that's the main entry point now