Recently my gas water heater was replaced, and this required shutting off
the gas. That caused the pilot light in the furnace to go out, and I don't
know how to relight it. It's a Carrier furnace, and I stuck a match in where
the flame should be, but there doesn't seem to be a gas supply. Is there
some trick to this?
Usually, the pilot light flame heats a thermocouple sensor that is in the
path of the flame. If there is no flame, the thermocouple sensor turns off
the main gas valve and won't let come on again until the pilot flame system
is restarted. This involves turning off the main gas valve on the furnace
and then turning it back on again to pilot, usually you have to push the
knob in to be able to turn it. Hold the knob in while lighting the pilot
flame, and keep holding the knob in for a few minutes until the thermocouple
heats up and sets the valve latch so that you can eventually let go of the
knob and the pilot will continue to operate, heating the thermocouple
sensor. Then you can turn the valve to Gas On and the main gas valve should
be ready to operate for furnace operation. Do all of this with the
thermostat turned down to low setting, and the switch to the furnace in the
off position. Once the pilot system is operating, you can turn the power
back on the furnace, and turn the thermostat up and the main gas valve
should work. Since the gase was turned off, air may have gotten into the
line and you will have to hold the knob in for a while until the air bleeds
out and you have gas in the line.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.