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RpaulB 01-13-2008 09:25 PM

Luxaire Flame Lockout
Luxaire Mod. G8T10012UHB11A Establishes flame that does not appear normal ie:blowing and not as high as normal and locks out. Attempts ignition twice more successfully but locks out the third time.
The 7 flashes on the circuit board indicates possible sources to correct the problem but none of them take into account the inferior flame condition. This was information received over the phone with my Son. Had him lightly tap the gas valve during attempted ignition and at one point established a normal flame and no lock out occured. The gas pressure seems normal when testing other gas appliances. Suggestions Please

HvacWiz 01-13-2008 10:36 PM

The gas valve itself might not be opening all the way.

bigMikeB 01-13-2008 10:53 PM

You need to have the gas pressure at the unit checked with a manometer for the proper pressure.

RpaulB 01-14-2008 03:58 PM

Thanks HvacWiz, that was my original thought or possibly a transformer with low voltage. For tomorrow afternoon, I have a new gas valve $55, a flame sensor $15 and a 24 volt 40va transformer (my garage stock)to try on the unit. Purchasing these items is less expensive than a service call.

RpaulB 01-14-2008 04:02 PM

Thanks to you too bigMikeB, the kids called at work at 9 am and told me that they couldn't get the oven lit lastnight to do a pizza. Well heck, that's the problem!!! Call the gas company for a check of their system. They responded pretty quickly and just as quickly said the pressure to the house appliances was "ok". Wasn't there so I don't know how they measured the pressure or what it was but my Daughter-in-Law said the oven fired up when turned on, the waterheater worked but the furnace still wouldn't establish a flame. So that's when I purchased the items for tomorrow.

bigMikeB 01-14-2008 04:05 PM

First off the flame sensor doesn't have anything to do with flame size or stability. Secondly, if the transofrmerr was weak the gas valve would chatter. Thirdly, I wouldn't condem the gas valve without testing it. You may have a bad regulator or one that is going bad.

HvacWiz 01-14-2008 04:21 PM

Once you change the valve you should be fine, like bigmike said you will not need to change the flame sensor, but since you picked one you might as well.

RpaulB 01-18-2008 04:06 PM

Hey Guys, Thanks so much for all the assistance on this.
Went over to their house on the 15th. Did a visual of the
furnace and noticed nothing out of the ordinary. Set the tstat to call for heat and turned the service switch to on. Combustion fan start, igniter glow, gas valve open, flame (a good one) in about 10 seconds or so supply fan start. Heated up to tstat setting, turned off and restarted when tstat called for heat again. Let this take place two more times and at about 8:30 pm went home. Called in the morning to check and all is well. The only thing that was done is the gas company made that visit on Monday and said nothing was wrong. Not so, he had to have adjusted the pressure on their regulator. In addition, their oven now lights quicker than it had in the past few days. Left the furnace as found except for being warmer. They now have some spare parts for another day.
Thanks again for the assistance. Have a GREAT weekend

bigMikeB 01-18-2008 04:15 PM

They are supposed to change out your meter and regulator on 10 year intervals free of charge. As you stated the guy probably adjusted the spring screw on the regulator before he came to the door. Glad it all worked out.

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