Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Blower runs, Ignitor glows, no 24V at gas valve, no click....

I have Carrier Weathermaster 8000 with ces0110057-02 control board.
When thermostat calls for heat, I hear click on the board, diffuser turns on, ignitor glows shortly after... and then NOTHING. I measure V across 2 terminals on gas valve as well as each terminal and ground. All measurements show 0V. Main blower works fine since I can turn my fan on and it runs. I checked 3A auto fuse on the board and it has not blown. I checked the wire terminals and nothing seems loose.

Do I have a bad board? If so, is it worthwhile to spend $$$ on the replacement board? My furnace is 13 years old.

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Check the two wires coming directly off the transformer. They will be connected to the board the line voltage will be black and white and the 24voltage will be something like blue and red undo from board and check to see if you have 24 volts there. If not your transformer is bad 10 dollar part. Take it to Heating and Air parts house to replace. Let me know ken

Posted on Dec 13, 2008

  • Ken Bledsoe Dec 17, 2008

    Did you get your unit fixed? ken

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The unit cycles through all levels and then displays Ignition failure, code B2. I replaced the flame sensor, the ignitor, and there is natural gas at the gas valve.


Sequence of operation for most Gas fired furnaces...
Demand for heat from t-stat
Control board demands combustion chamber purge
(IDM /induced draft motor if it has one)
Control board tests all safeties (this is usually via
the IDM wiring.)
Control board sends 24v to PV at the gas valve igniting
the pilot OR control board sends voltage to the
ignitor as in yours.
Control board sends 24v to MV at the gas valve.
Control board allows time for heat exchanger to warm
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Your sequence of operation? Won't be the flame sensor unless ignion has been achieved. If the ignitor is working/glowing red? Is the IDM working? Make & model#?

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My Bryant Gas furnace model number is 373LAV036095 the pilot light won't light. Gives us indication that the pressure value is stuck??? Sends into lockout mode. Where is the pressure value located in the...


This is a down flow unit. There is no pressure valve on this unit. Here is all the parts on this unit.
1. Manual - reset, when used.
2. Blower and blower motor
3. Relief box also known as a exhaust flue.
4. Gas valve control knob or electric switch, ON/OFF
5. Gas Valve
6. Gas burner
7. Ratting plate
8. Blower door safety switch
9. Blocked vent safeguard tube and switch
10. Gas Manifold
11. Manual limit switch (2)
12.Hot surface ignitor
13. Flame sensor
14. Inducer blower motor
15. Control board with relays and transformer.
That is all the parts. The first thing the heater gets a call from the thermostat to the control board marked W. The board sends 24v to the inducer fan relay which makes and causes the inducer fan to come on now there is a small tube that runs from the inducer fan box to a switch when the switch makes it sends power to the board which proves you have cleared the exhaust flue then the flat surface ignitor starts to glow and then gas valve opens and fires. now if this tube is stopped up the heater will not fire and will lock the unit out. Also if the flue is stopped up with trash it will do the same thing. If you are not familiar with gas heating units you should call a service company out and check out the system there is a lot of things that need to be checked out every heating season as to keep you and your family safe.

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Does not ignite, no gas getting to unit to ignite. Gas supply is on.


More than likely your gas valve or control board is malfunctioning. You can use a multimeter to check for voltage at the gas valve when the furnace calls for it. In sequence, the IDM will come on, then another click that starts the ignitor which glows, then the next click will be the board sending power to the gas valve. You should have 2 wires on the gas valve, put the meter leads there and when the board calls for the gas valve, you should have 24v at the gas valve. If not, the board is faulty. If you do have the voltage there, the gas valve is faulty and needs replaced. Sometimes you can take a pair of pliers or similar tool and gently knock on top of the gas valve and it will get the valve "unstuck" which can get you some heat if needed. Hope this helps!

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The water heater red light keeps flashing rapidly on my Powervent 2 model 41VRP40N. It is not producing hot water and when I read the manual it says it needs more heat. What does this mean. How do I fix...


There are many things to check. The single most important test is for 24V at the gas valve after the ignitor is supposed tp be on. 19 V or less and there is either a bad ground or the ingition control board has failed. (Wire ground problems are a high probablilty)

Here is what the book says:

PROBLEM #1 - HOT SURFACE IGNITOR DOES NOT GLOW RED

(Remember to wait for purge time, 17/34 seconds, on models so equipped).

Possible causes

A. No main power

B. Faulty transformer

C. Faulty thermostat

D. Faulty limit switch

E. Faulty blower interlock switch

F. Faulty hot surface ignitor

G. Faulty ignition control

Solution

Step #1

Perform normal system checks of main power, transformer, thermostat, limit

switch, blower interlock switch, and replace faulty component.

Step #2

With power on and thermostat set at its highest position, check voltage

between "TH" and "TR" on HS780 ignition control. If 24 volts is not present

check output at transformer. If no, replace transformer. If transformer

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limit switch, blower interlock switch. Check for 120 volts between "neut"

(L2) and "120" (L1). Check for 120 volts at the ignitor across "IGN" and

"IGN" terminals on the HS780 ignition module. If 120 volts is present,
replace ignitor. If no, replace the 780 series module

PROBLEM #2 - IGNITOR GLOWS RED BUT MAIN BURNER

WOULDN'T LIGHT

Possible causes

A. Improper ignitor alignment

B. Faulty ignition control

C. Faulty gas valve

D. High inlet gas pressure

E. Polarity reversed

F. No earth ground

Solution

Step #1

Check for availability of gas at gas valve. Make sure the manual valve

upstream of the gas valve and the gas valve are in the full on position. Also

make sure gas is being supplied to the system at the proper pressure, too

high will lock-up the valve.

Step #2

Check proper polarity of "NEUT" and "120" on the ignition control by reversing

the wires, if reversed gas valve will not open. If this does not solve the

problem, replace wires as they were.

Step #3

Check for proper ignitor position.

Step #4

Check for a good earth ground by using a meter connected between L1

and furnace chassis. Should read 120 volts, if no, check and/or repair ignition
ground wire or ignition control mounting screws.
CAUTION POLARITY MUST BE OBSERVED

Step #5

Check for 24 volts at the gas valve terminals; "1" and "2" on a 7200 series,

"M" and "C" on a 7100 series, "TH" and "TR" on a 7000 series. If yes,

check wire integrity or change the gas valve. If no, change the 780 series
ignition module.

That is pretty much all of the troubleshooting required.

Thanks for choosing FixYa,
Kelly

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