gas heater problem / infrequent ignition
#1
gas heater problem / infrequent ignition
RE: intermittent ignition problem
Rheem Deluxe Drum 90Plus [11/92 installation date]
model UGED-10ERAJS
105000 btu / natural gas / 120v blower
Problem: on infrequent schedule [several week interval] ignitor sequence willnot properly cycle.
Blower goes on as called for by thermostat.
Ignitor goes on [approx 25 seconds prior to gas].
Gas valve opens, Gas ignites, stays lit approx 5 seconds.
Blower pitch sound changes / gas goes out, ignitor goes out.
Cycle repeats in approx 30 seconds.
After 'rest' period of approx 1hr +, unit reverts to normal operation & remains in seemingly regular cycle operation for several weeks until next round of symptons.
What is causing this infrequent problem?
Rheem Deluxe Drum 90Plus [11/92 installation date]
model UGED-10ERAJS
105000 btu / natural gas / 120v blower
Problem: on infrequent schedule [several week interval] ignitor sequence willnot properly cycle.
Blower goes on as called for by thermostat.
Ignitor goes on [approx 25 seconds prior to gas].
Gas valve opens, Gas ignites, stays lit approx 5 seconds.
Blower pitch sound changes / gas goes out, ignitor goes out.
Cycle repeats in approx 30 seconds.
After 'rest' period of approx 1hr +, unit reverts to normal operation & remains in seemingly regular cycle operation for several weeks until next round of symptons.
What is causing this infrequent problem?
#2
could be a flue problem
what type of pipe, how long, what size and is the water heater hooked into it? the pressure switch may be dropping out, the noise pitch change you hear could be the increased load on the inducer motor, as there is more load after ignition. just a few ideas
#4
Information that came with furnace indicates unit will do 5 retries on burner sequence before 'lockout' occurs. Turning unit off via thermostat or emergency switch for 10 seconds reprograms.
This morning I stopped unit after approx 10 retries. Would that indicated the integrated furnace control [IFC] is in error?
This morning I stopped unit after approx 10 retries. Would that indicated the integrated furnace control [IFC] is in error?