I have a DESA propane vent free heater; model CBT30PT (4 yrs old). The heater was cleaned and worked fine until this year. The pilot lights and the heater functions for about 15 - 2o min. then the heater completely shuts down. It will restart and run for a while then shuts down again., Any suggestions?
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sounds like an obstruction in pilot assembly.try using canned compressed air to blow directly into pilot. this technique is successful about 70%. if not,pilot assembly must be removed and cleaned thorougly
I have a Rinnai Ventless heater hooked up to a 20 lb propane cly with a Moble home type regulator in line, and when I light it the pilot light lights and stays on. When I turn it to the heat position the pilot light go's out and that it!
Check regulator on the unit.
Check pilot unit on the heater
use soapy water to check for leaks if see bubbles turn off main gas supply valve.
always turn off gas supply before any checks or repairs are made
when all else failes call your local gas provider to check heater and gas supply
I recently had a similar problem with my DESA wall-mounted vent-free natural gas heater. We had it repaired but the problem recurred annually until it wouldn't stay on, even on low. There is a part known as an oxygen depletion sensor (sometimes called a flame sensor) that is part of the pilot assembly. When it is working properly, it sends a very tiny current that lets the heater know to keep feeding gas. After a few years the sensor can get rusty, which interferes with its electrical job, causing it to tell the heater to shut off so it doesn't kill you. A temporary repair can be effected by removing the part and cleaning it with sandpaper or emery paper. I suppose compressed air might work too but probably not for long if it is impeded by rust and not just dust. I found all this out from the repairman who thought he had it fixed and then it went out as he was leaving. He couldn't find the part but I found it online at a DESA-authorized distributor and it was about $40. He installed it in about 10 minutes and it has now worked like new (it's at least 15 years old) for over a month.
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