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Vulcan 1GR35M... | Answered on Oct 20, 2013

My Ultra21 fired up for a while then after a few minutes the flame extinguished and the fan did its usual cool down thing, so basically we were getting warm air for a few minutes and then cold...

Try this...

Safety is you number one priority here. ( its not dangerous but its always good to be cautious)

Switch the furnaces power off from the power point to stop the heater firing up again.

Take off the cover for the circuit boards, take off the cover that covers the burner/fan etc.

You will see 2 wires from the main circuit board (one black and one grey), they feed through a grommet and feed into the burner area.

One is your igniter (i think) and the other is you flame sensor.

The one with the bent or right angle probe is the igniter.

The other is the sensor (right hand one when your viewing from the circuit board end)

Unscrew each one carefully and give it a clean with some pot scourer or steel wool etc.

I did this last night and it fixed my problem

Vulcan AUW230A... | Answered on Sep 16, 2013

Standard Appliance, Appliance parts incorporated, yhese types of places.

Vulcan AUW230A... | Answered on Jul 05, 2013

Hi Dave, my neighbour has a Vulcan Compact 60 that is doing the same as yours, except the cycle time is even shorter, only four minutes total. The temperature in the house barely rises and never reaches the thermostat setting. Altering the thermostat anticipator does not alter the cycle time. Therefore, as you have found, the fault is not related to the thermostat. The gas technician who inspected the heater said he could see the unit was faulting, but didn't think he could fix it. WTH? To help my friendly neighbour, I have asked numerous experienced techs since and those few who actually seem to know anything have helped me piece together what is probably (I emphasise probably) happening. Current thinking is that the fan is not blowing enough air and the heat exchanger is overheating, which trips the over temp switch (limiter), cutting off the burner. Eventually the fan cools the unit down enough to switch itself off and reset the limiter, then the cycle repeats.
The remedy is to replace the fan or replace the fan bearings, if they have become tight, as is likely the case. It might also be necessary to replace the combination fan/limiter switch, because the contacts are probably arcing due to the extra current drain of the fan with tight bearings (I know this because the arcing causes TV and radio interference to myself and others in the vicinity, which interference ceases when the heater is turned off and resumes when the heater is turned on and had about 20 minutes to heat up). Important: If no action is taken, the heat exchanger can be damaged and/or cracked, especially if the limiter contacts weld closed, which will allow the heater to exceed the limit temperature and probably crack the heat exchanger. This in turn will allow carbon monoxide fumes to enter the house via the ducts. Therefore the problem should be fixed ASAP.
I am currently trying to find someone who understands this heater to the extent described above and therefore has some chance of repairing it correctly. No success as yet, similar to your own experience.
Dave, if you discover anything at all about this fault, please let me know, as I am not going to waste my money on gas techs who are unable to fix the problem because they don't understand the system to the required degree.
Parts can be obtained from many gas supply houses. The one I normally use quoted about $300 for a fan and $150 for a fan/limit switch. This seems too expensive to me. I could get a whole second-hand unit for about $300. Will try to let you know if I make any further discoveries. Anyway, best of luck. Regards, VC60.

Vulcan Heating &... | Answered on Sep 30, 2012

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