Older model Mr. Heater, MH50K, replaced dry rotted hoses and had to play with adjustment to get to burn but it runs for 30 seconds and then stops. All I have to do is power off and back on and it will run another 30 seconds. Doesn't seem to be the limit switch because I can unplug it and it will still run the 30 seconds. I don't see any other safeties for this. Any ideas?
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Wonder if it's a problem with the flame sensor (part ID #31 in the parts list linked below)
Here's the parts list and wiring diagram that may help, so that you can check it out.
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Thank you. You are right the flame sensor had failed. I just didn't have one to try when I was troubleshooting it and didn't want to jump it. I used my multimeter and sure enough no continuity, but I wasn't sure. Visited local HVAC store and bought one for a home furnace which I had to do a little MacGyver on to plug in and mount, but it works! Thank you for your idea and schematic. That's always a big help.
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