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I have a Ruud 90 plus deluxe drum furnace that initially

I have a Ruud 90 plus deluxe drum furnace that initially starts fine everytime, but when the main blower comes on the gas valve shuts off. The flame seems to flutter or lift and the flame is somewhat sooty not clean blue but yellow when blower starts the flame flutters then the gas valve shuts off.JA: Did you check the furnace's filters?Customer: yes they are cleanJA: Do you plan on doing the work yourself?Customer: yesJA: Anything else we should know to help you best?Customer: after several tries, the furnace will eventually keep running, but never on the first try. the igniter always glows and gas always comes on initially. I checked the gas valve pressure with a digital manometer and it is at 3.50" w.c. incoming air not obstructed, the condensate drain is clear. I did notice the gas valve pressure did fluctuate quite a bit between 3.4-3.7" w.c. Could the gas valve be bad?

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Rick

Supervisor

26,298 satisfied customers
I have a very old (1987) Lennox furnace that is not working.

I have a very old (1987) Lennox furnace that is not working. Pilot light is lit. Fan blows, when set to fan and not to heat . Thomocoupler was replaced in Nov. I'm out of ideasJA: Did you double-check the thermostat's settings? And what about the filters?Customer: Yes the filterse are new and the thermostat is seething correctlyJA: Do you plan on doing the work yourself?Customer: YesJA: Anything else we should know to help you best?Customer: It's a model #612D2-B2-6

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Sean

HVAC

312 satisfied customers
Subject 1 of 2 Trane Air Handlers 4tgb... I have dual

Subject 1 of 2 Trane Air Handlers 4tgb... I have dual systems here at the house both systems are down.. Taking one at a time...JA: I'll do all I can to help. How long have you been dealing with this?Customer: This system a few days... the other system I had my HVAC guy on it and his daughter died before he could trace the short in the 24 volts... Both systems at different times had melted one leg of the 60 amp breakers.. That is repaired... Please note that I am an electronic and former senior service engineer for Afga and NASA with little or no experience in HVAC but I can troubleshoot and follow schematics. Here is what I have right now.. After replacing the thermostat, it was acting flaky, now seems to work consistently, everything appears to work... Oh and by the way these have electric coils as aux heat... The relay to the coil is now engaging properly and there is proper voltage to the coils...and the coils measure around 11 ohms with power off so they must be good. I also think they must be good because with fan only my clamp meter indicates .5 amp at the air handler breaker input, but when the thermostat is demanding aux.... the amperage increases to about 10 amps on each leg... But it is still cold as hell and won't go past 57 degrees. This may have been going on for awhile because I noticed the aux stays on for a long time, but in the last few days the outside temp dropped below 20 degrees and the heat exchanger can't keep up with that... so the question is why am I drawing amps because of the coil but they aren't producing heat????JA: Did you double-check the thermostat's settings? And what about the filters?Customer: The hvac dude programmed the thermostat that I borrowed from the other system that was down... what is there to check? the relay to the coils is engaging but no heat, as though there was an open coil, but can't be because of resistance and amp readingsJA: Do you plan on doing the work yourself?Customer: i am tryingJA: Anything else we should know to help you best?Customer: for this side of house no

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gotoman for ac

HVAC Service manager and owner

Associate Degree

5,374 satisfied customers
I have a lennox furnace, I have ignition and the burners

HI, I have a lennox furnace, I have ignition and the burners light up, but I don't have much heat, I have cleaned the flame sensor, the ignighter looks okJA: Did you double-check the thermostat's settings? And what about the filters?Customer: yes the thermostat is set at 80 but the house is only 60, the filteres have been changed, is it possible a limit switch is stuck?JA: Do you plan on doing the work yourself?Customer: yesJA: Anything else we should know to help you best?Customer: the lights on the board are blinking together at a fast rate, but once they did blink alternate at a slow rate before I cleaned the flame sensor

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Rick

Supervisor

26,298 satisfied customers
I have a York Diamond 90 furnace blowing air but no heat. 5

I have a York Diamond 90 furnace blowing air but no heat. 5 flashes showing limit switch open? No display on thermostat upstairs. And of course it below zero here:(JA: Did you double-check the thermostat's settings? And what about the filters?Customer: Thermostat is "dead" no display at all.JA: Do you plan on doing the work yourself?Customer: yesJA: Anything else we should know to help you best?Customer: n Nothing else that I can think of

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Rick

Supervisor

26,298 satisfied customers
I'm trying to troubleshoot my carrier furnace. Getting a 33

I'm trying to troubleshoot my carrier furnace. Getting a 33 code and trying to reset flame rollout switchJA: Did you check the furnace's filters?Customer: It was changed recently but I just put a new one in. Furnace comes on for a few minutes but doesn't stay on and there seems to be a burning smell coming from registersJA: Do you plan on doing the work yourself?Customer: I'm hoping to find an easy fix if I can If not I'll be calling someone in the morning. Have a 10 month old baby I'd like to keep warmJA: Anything else we should know to help you best?Customer: About 6 weeks ago it went out but after resetting main power switch off and back on its been ok. Getting code 33 then 13

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D.E. Anderson

Industrial Refrigeration Service Manager

342 satisfied customers
My furnace won't kick on and it's freezing in here. I just

My furnace won't kick on and it's freezing in here.JA: Did you check the furnace's filters?Customer: I just changed them now but still hasn't turn onJA: Do you plan on doing the work yourself?Customer: I have no money, so I'm going to have to.JA: Anything else we should know to help you best?Customer: The furnace is a coleman for mobile home, and the green light is flashing 4 times.

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528 satisfied customers
I am servicing a Lennox upflow gas furnace mode

I am servicing a Lennox upflow gas furnace mode lG20Q3/4E'100'1, a 100,000btu unit manufactured in 1990. As you know this model has a spark ignitor for the pilot light. The problkem is that the pilot light stays lit whether there is any power to the unit but when the unit receives a signal from the thermostat for heat it does nothing except open the door to the combustion chamber, Is the gas valv e defective or is it the ignition module that is bad.JA: Did you double-check the thermostat's settings? And what about the filters?Customer: Filters are clean and the thermostat is sending a signal for heat to the furnace, as checked at the furnace.JA: Do you plan on doing the work yourself?Customer: yes, i am a serviceman.JA: Anything else we should know to help you best?Customer: My thoughts that it could be the module are contradicted by the pilot remaining on even when there is no current to the furnace.

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gotoman for ac

HVAC Service manager and owner

Associate Degree

5,374 satisfied customers
I have a gas furnace model # 383kav036070 and the error code

I have a Bryant gas furnace model # 383kav036070 and the error code is 12JA: Did you double-check the thermostat? And what about the pilot light?Customer: changed thermostat and it doeshave a pilot lightJA: Do you plan on doing the work yourself?Customer: yesJA: Anything else we should know to help you best?Customer: no

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Brian HVAC Guy

HVAC/R Consultant

High School

1,618 satisfied customers
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