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I have a vulcan quaser wall furnace 40mj man installed 1993 the last couple of years I notice the heat is quite good for an hour or so then it blows cold air, turn up heat ok for a short time then cool again . \I have called local gas servive and each one lights up the heater runs for 5 to 10 mins and say there is nothing wrong is there a set service and cleaning for this heater JK

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

Therinnaiguy
  • 1420 Answers

SOURCE: Inefficient (big, yellow flame) on wall propane heater, using up propane too fast

A clue to what could be wrong is that you mentioned it took 10 minutes for the pilot to go out. It could be your gas valve. Get a technician in to check your gas pressure both before the gas valve and after. Have them check it as the water heater is running.

Posted on May 16, 2008

  • 252 Answers

SOURCE: my fridgidaire gas furnace is blowing cold air

Today’s furnaces are controlled by a computer which constantly monitors for problems. When it detects a problem it will shut off the burners. Depending on the problem and the specific furnace it will either “lock out” the furnace or cycle it through a purge (to rid it of un-burned gas and excess heat) and then attempt to re-start it. If the problem continues to occur then it will “lock out”. Depending on the problem and the furnace it may again attempt a re-start after several hours. In any case if the problem was not detected/caused by a sensor which requires a manual re-set, when the power to the computer is interrupted or the call for heat is interrupted the computer is reset and it will again attempt to re-start the furnace. The most common problems are:
· Low or lack of flame sense. Different furnaces use different methods to detect a flame – often these “flame sensors” become dirty and have to be cleaned (usually with sandpaper or steel wool).
· Bad igniter. (Doesn’t light at all).
· Clogged combustion air intake or exhaust.
· Clogged condensate drain. (90+% efficient furnaces).
This is not a complete list, only the most common!
Depending on where you live your HVAC system runs more than anything else you own (including your car). All furnace manufacturers “recommend” “regular maintenance” of your furnace. In fact, all that I am aware of state in their warranty that the warranty may be voided due to lack of “regular maintenance.” The industry has defined “regular maintenance” as yearly (in fact, some manufacturer’s warranties state yearly). Due to safety, liability, and the need for many other things to be checked, cleaned, and/or adjusted (2-page checklist where I work) to ensure safety and efficiency. Due to the large number of furnaces and the differences between them. Moreover, due to the terms of this site, I WILL NOT AND CAN NOT give you specific instructions on how to perform repairs on your furnace. I suggest that you contact a local, reputable, HVAC service company for (a tune up, preventive maintenance, general maintenance, yearly service call, general service, or whatever they call it).

While I may not have told you how to fix your furnace yourself, I have told you how to fix it. Please rate my answer.

Posted on Mar 14, 2009

co7196
  • 3433 Answers

SOURCE: error code f1 on vulcan basic deluxe

Ck and ensure there is a pilot light.No pilot light, no gas.

Posted on Jun 01, 2009

  • 53 Answers

SOURCE: Vulcan Quasar 40 wall furnace - electronic display problem

Have a gasfitter bypass the clock. The clock is the source of the problem. You will then have a manually operated heater.

Posted on Oct 08, 2009

  • 118 Answers

SOURCE: Gas furnace is constantly blowing cold air

An indoor blower running when it is not supposed to usually indicates an overheat condition. I would guess that it has been cycling on and off for some time and finally caused the high limit to stick and not auto reset. if you tap it sometimes they reset. the real problem is that it has been overheating from lack of airflow, over sized unit, not enough return air, too many closed registers, dirty filter, dirty squirrel cage blower and or air conditioner a-coil. If you get it started again sit and watch the unit run the flames should come on and stay on for the entire heating cycle, not going on and off.
I wish I could help you more but it is difficult without seeing the problem myself. Good luck! this should get you started!

Posted on Nov 03, 2009

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