My mastertemp 400 would shut off after about 28 seconds with an E05 error code. I replaced The Stack Flue sensor, tested it. All good until I tried it the next day with the side panel back on. Same problem.
I vacuumed the intake, but occasionally get the same problem with the panel on. When I leave the panel open, the heater works every time.

I’ve seen the air intake panels or pvc pipe. I think this would solve my problem, but it looks like such a simple add on. I was wondering if anyone has DYI’d this? If I’m not mistaken, just PVC, cut a hole in the panel to match, a little screen over the PVC intake, correct?
Just seems way overpriced for what I’ve seen online.
Any thoughts on this?
I vacuumed the intake, but occasionally get the same problem with the panel on. When I leave the panel open, the heater works every time.


Just seems way overpriced for what I’ve seen online.
Any thoughts on this?