I'm afraid i don't have a really good answer for you.
several years ago, my gas range had a somewhat similar problem. the igniter
(??) would glow, but the oven would not come on because the gas would never
come on. the repairman said the igniter was bad (not pulling enough amps i
think). after replacement of the igniter, it worked fine.
however, the same symptoms occurred about 2 years later. this time, i
replaced the part myself. the stove has been OK since then.
but you might be well advised to call a repairman-could be a dangerous
I would appreciate any thoughts about this problem:
Thermostat calls for heat. The little purge air blower comes on. The "glow
plug" comes on. Gas does not come on. After a minute or so, the glow plug
goes out. This situation may continue for some hours, with the purge air
blower on and the glow plug coming on from time to time, but no heat. There
is a green diagnostic light on the gas control; it is flashing bright/dim
(which the manual says it does in normal operation).
I usually go through these kinds of steps to get it to respond properly:
-there is an off-on switch on the gas control body; I cycle this off and on
once or twice.
-there is a wall switch for the whole furnace; I cycle this off and on once
-I switch off and on the thermostat on the wall.
After some combination of the above steps, the furnace will properly go
through its proper sequence: purge air blower, then glow plug, then the
small pilot burner, then the main burners, then the main blower. It will
continue to cycle properly for several cycles, perhaps days. Then it will
flunk out again. Problem has occurred twice during this winter season.
I have also noticed a slight variation where the purge air blower comes on
for several minutes and then stops without ignition occurring, with that
sequence repeating several times (maybe 4-5 times) after which the gas
natural gas furnace; 80,000 btu/hr
Honeywell thermostat and gas control
about 7 years old; as far as I know, no maintenance has ever been done
furnace is in a closet in my one story home
there is no smell of gas during the problem
A label on the unit "installer's instruction manual" shows:
Mod # MBA 080 NH4R
Serial # 990917039