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The wires in my gas furnace have been messed with and the heat side of it no longer works. I need help getting it to work properly.

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Type in the manufacture name to get to that site, and somewhere type in the name & model #'sand search wiring diagrams..!

Posted on Sep 08, 2008

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Put in a second t-stat to run just my blower on my


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If you have gas furnace, the outside unit will not come on unless you have dual fuel/ gas and heat pump. If you can look at wires in thermostat, if you have no wires going to O or B then you don't have heat pump. Normal tstat wiring for gas furnace and air conditioner. R,W,G,Y and maybe C.

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I have an Evcon hot surface ignition furnace and can not get the heat to come on .I set my thermostat on desired temp and starts running,but the blower wont come on,on auto I have to switch to the on...


Troubleshooting and Repair
Furnaces with electronic ignition systems may be much more efficient than their early counterparts, but they do it largely through electronics. However, there are still some troubleshooting you can do but fixing the problems can involve replacement of parts more so than repair or adjustment. PROBLEM: Furnace burner will not ignite
Possible Solution
  • With a Hot Surface Ignition (HSI) system, if a gas hissing sound is heard for about 7-10 seconds and the burners do not ignite, the furnace will go into lockout mode.
  • To reset turn the furnace power switch off and back on and try again. The switch is probably located on the side of the furnace. A reset button may also be found on the solid state controller. If resetting fails again, proceed as follows.
  • Turn off power and gas to the furnace
  • Remove and check hot surface igniter being careful not to touch the heat element. If it is cracked or damaged, replace the igniter.
      PROBLEM: Furnace comes on for 7-10 seconds then turns off Possible Solution:
      • Turn off power and gas to the furnace
      • Remove flame sensor from its bracket. Lightly clean the surface with fine emery cloth and replace.
      • The problem may also lie in a bad ground or the the black and white wires being reversed (reversed polarity) at the junction box or outlet powering the furnace.
      • The electronic ignition control module must ensure current flow through the flame sensor to ground and if the polarity is reversed in the circuit there is no voltage potential and the flame sensor does not work and closes the gas valve.
      • If the black and white wires are connected correctly and the flame still drops out, then the issue may be a bad ground. Using a volt-ohm meter, measure between the white wire and the ground wire to be sure you have no voltage.

Nov 01, 2010 | Air Conditioners

1 Answer

I have a heil furnace ac is working heat wont come on?


Check the white wire is making contact well in the t-stat.
Is it gas heat or electric/heatpump
If gas then check your flame ignition system to determine if it is lighting a pilot or has a hot surface type glow element. If it does not sense the flame it will refuse to run gas for heat and or check that the electric enducer fan is comeing on before the pilot even attempts to light. It must run to prove a draft induction exist for the furnace baffles before it will attempt to start heat.
If it is a heat pump then it should fail to heat side on the reversing valve and not really need to be checked since your AC works. The call for AC has reversed the valve to even get cooling. So it is going to be heat strips failing or sequensers failing maybe even low refrigerant on a heat pump system. I know this is all a bunch to digest remember it is usually electrical and just a loose wire! So start from there and T-stats do go bad just because they can!

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1 Answer

I have a Rheem A/C Heat Pump split with gas backup. The gas unit is mounted in the air flow directly before the A/C HP coil. Should the gas unit be wired as stage two heat, or is it OK to wire it as just...


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I'm including a link with information on one type of fossil fuel kit. It explains how it works. If you have limited HVAC service knowledge and/or experience, I recommend having an experienced service technician check your system operation in all modes to ensure proper operation for longer system life at peak operating efficiency.
http://www.ntsupply.com/files/products/ffk100operation.pdf

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1 Answer

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You need to check gas vent ASAP. You should not be getting any odors from your furnace. Have a technician check your furnace. Could have hole in Heat exchanger. If so you and anyone else there are in danger. Please do not operate till it has been checked. Very very dangerous Rus

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24v wiring for RHEEM heat pump


Brown wire connect to com C on terminal block in your furnance (0VAC from 24VAC transformer)
Yellow turn on compresor (hot wire from 24VAC Transfrormer)
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Purple prevent starting compressor in Heat pump and furnace in same time

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Code #33 on Bryant 355MAV 90i Furnace


'Limit or flame rollout switch is open'. In my case, the flame rollout switch had tripped due to an overheating? I had to push the button between the wire leads to reset the switch. Then when I turned the power back on, the furnace started up like normal.

Why did the switch overheat and trip? My current theory is that there was a rubber grommet around a pipe near the switch that had slid down and was no longer sealing the furnace?

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Heat pump


What type of furnace? strip heat....gas... I would check the reversing valve.Run the unit in cooling have someone switch the stat to call for heat....."Whooosh!!!" the reversing valve will switch over.Other methods of switching the valve , remove one wire, remove the nut and slide the solenoid off the valve will reverse. The switching solenoid can be checked magnetically by using a small screwdriver. Switch from cool to heat or heat to cool this way you can check if the valve is getting a signal .
Heat pumps are a fairly complicated simple device..... sometimes just switching the valve back and forth a couple times gets it unstuck. Remember air coming from the duct will feel cooler than air from a gas furnace .
Most customers don't think they are working when they really are. 100 degree heat is not that hot to 98.6 degree person who is used to 120 degree gas heat!

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