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Gmoney5712's avatar
Gmoney5712
Explorer
Dec 10, 2019

Dometic comfort zone furnace turns off after 30 seconds

I have a 2018 voltage and the comfort air dometic zone control thermostat. Last week it worked well and now it won’t stay on longer than 30 seconds. I have reset it by turning it off and pressing and ...
dougrainer's avatar
dougrainer
Nomad
Dec 12, 2019
if it runs 30 seconds then shuts off, then the burner probably has not lit. The furnace then goes to lock out. Odds are the hi limit switch is stuck open. Take a hammer and gently bang on the outside metal exhaust tube for about 30 seconds. Then try to run furnace, if it runs and lights you need the Hi limit replaced. Doug

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