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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My lennox g21q3-60-1. It wont kick heat on. Gas is on. light

Customer Question

My lennox g21q3-60-1. It wont kick heat on. Gas is on. Green light on Johnson control box is flashing on and off. I hear clicking but it wont kick on
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

OK lets do this. Turn power off to furnace.thermostat off. The power on and call for heat at thermostat.Then check gas valve to see if we are getting 24 volts ac to the valve.We will go from there.