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Furance is not fireing up replaced the thremostate and the gas valve it is still going through its cycle like it is trying to fire control board has a red light flashing 4 times and than pause any ideas?

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Sound like high limit switch or high presure switch

Posted on Nov 14, 2008

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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
then calls for blower operation.

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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Pentair mastertemp 250 NA. heater will not fire, no error codes. starts fine, gas flows, igniter heating but still will not fire. It has a new valve, gas pressure entering valve from new regulator is 8.35...


All appearances - No fuel to ignite!
evrything else looks good, proper gas pressure, proper volts at igniter, etc - it should ignite! If fuel present, heater should Fire!
make sure all valves are open.
Gas valve is ON
AND purge any air from gas line.
IMPORTANT ****. If you bled gas line, don't try to ignite for a few minutes. Allow gas to dissipate first, use a fan to help.

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I have and lg gas dryer modeldlg7188rm cooling light is on constant wouldnt heat atall. replaced gas valve now it will fire up but after a few seconds shuts down. Cooling light still on on any cycle is it...


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Raypak 2100 265A displays GVO. I know it means Gas Valve Open, but I do not know what is wrong. It is a IID Electronic Pilot. I see a slight flame when the igniter lights and then the system goes into GVO...


Here is the directions from raypak on this code.

1. Turn off power and disconnect ignition wire and gas valve wires from cpu board.
2. Turn on the power and watch for spark at module.
3. If no spark is observed, turn off power and replace the board.
4. If spark is observed, turn off power and reconnect gas valve and ignition wire.
5. Turn on power and unit should fire.
if unit does not fire and code reappears, turn off power and disconnect gas valve wires from the board and remove MV,PV and ground wires from the gas valve. Clean and reconnect wires.
7.Plug the gas valve back into the board and torn power on. Unit should fire.
8. If the unit fails to fire, Replace the gas valve.

Its not a good code to get. Hope this helps

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Will not light blower comes on i here it click but no flame i get a if code


Using a manometer, check the manifold gas pressure during start up. Does it go up to about 3" WC? If so, bleed the air out of the line until you get a strong smell of gas and try again.

If you are not getting any gas pressure you will need to check the power coming to the gas valve. Are you getting 24V at any point during the start up process? If so, the valve is bad and needs to be replaced. If not you will need a new control board.

John

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Oven won't turn on but burners still will, the other day there was a small fire inside of the oven. The oven has not worked since that fire occurred, removed the sparker couldn't get fire started with a...


if you removed the Ignitor the oven will not light it has a safety valve that operates at this same time the ignitor is trying to get hot once it reaches a certain amount of power it will open the valve for the gas.
you may need to replace your ignitor,and or your electronic control board.

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Goodman model GMH95 no high heat


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