This still hasn’t fixed the issue as last night it averaged 2-4 start-up cycles per ignition.īefore having the HVAC technician out again, I was hoping that those on this forum could provide some guidance.Īs I understand the start-up, the inducer motor turns on, once appropriate draft has been developed as measured by the pressure switch, the ignitor glows and then after a certain amount of time, the gas valve opens and the burners ignite.Īny ideas on what could be causing the start-up sequence to not complete and opening the gas valve? This didn’t resolve the issue and after speaking to his supervisor was told that Lennox often has this intermediate voltage reading, but it is “normal.” He and the supervisor then determined that it must be the gas valve that is the issue and it was replaced about 6 days ago. First, he replaced the control board since he was getting “screwy” voltage readings of ~14v when it should have been 0. We have had our HAVC technician out to fix the problem. In all cases, the furnace ignites and heats as directed by the thermostat. However, it can take 2-4 start-up cycles to ignite the remainder of the time. The furnace probably ignites on the first start-up cycle about 85% of the time. When it begins the start-up sequence, the inducer motor kicks on, then the ignitor glows and then after about 25-30 seconds it either opens the gas valve and the burners light or it clicks/clunks, shuts down the inducer motor and after about 2 seconds begins the start-up sequence again. Hello, I am looking for some help regarding my 2 yr old Lennox ML180UH furnace.
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