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Furnance will not heat

I need a Trouble shooting manual for Model# RGUJ-05EA-ER RHEEM electric ignition GAS FURNACE.
Igniter turns red hot but the Gas Valve just shakes and makes a clicking sound and then the ignitor will go out.
Furnace does not fire up and fan does not kick in.
Gas valve is Honeywell Part# VR8205A 2008 reg 3.5 ADJ 3-5 Range 24V 60HZ total current .5 A uses class 2 transformer.
I also do not see any type of control board with a digital read out flashing any error code. Please Help.

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Check your voltage going into the gas valve. It should be 24-27 volts. If it is to low the gas valve will chatter. If the voltage is strong enough you have a bad gas valve.

Posted on Apr 03, 2009

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SOURCE: Trouble shooting manual for Model# RGUJ-05EA-ER RHEEM GAS FURNACE

replace the gas valve....test for 24volt at the gas valve input.  if you have this then it's a def gas valve relay not working.

Posted on Dec 29, 2009

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Posted on Jan 02, 2017

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I have a RHEEM RGUJ-05EA-ER GAS FURNACE in my attic. early in the morning and late at night when the temperature is low it does not trigger on. The thermostat is new as well as the HOT SURFACE IGNITION...


Couple ideas here. First is make sure the thermostat is level. Most do not work unless they are level. Second, make sure there is enough fresh air. It make have a low oxygen sensor which keeps it from lighting.

Dec 28, 2014 | Heating & Cooling

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Gas Furnace Troubleshooting With an Electric Meter


Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} The gas furnace is on the blink and you need to figure out what is the reason why the heater isn’t heating. Grab your electric meter, preferably a digital one, and we’ll check out some of the possibilities.

In your gas furnace find out where the power enters. Check the voltage between the black and the white wires. Make sure that the black wire is the hot and the white the neutral. Reversing these wires can make intermittent problems.

We have power to the unit, so let’s check further. If you turn the power on and the purge blower and the main blower both start to run then you probably have a high limit reset tripped. Look for the limit switch or switches to reset them. A little snap when you push the red button on the back will let you know that you found the right one. If there are no reset buttons then check for continuity across the terminals. If the switch is open then you need to replace it.

If your purge blower only runs but nothing else happens then you have one of two other problems. Either the igniter is bad or the pressure switch may be bad or the flue blocked.
Check the pressure switch first by seeing if you get voltage across the terminals of the switch. If the switch is closed like it should be with the vent fan running then you will not get a voltage across the terminals, this is good. Go on to check for the presence of power going to the igniter.

Many gas furnaces have an igniter that is very fragile and cracks easily. A small crack will keep the little bugger from getting hot and being able to light your furnace. Pull the plug apart going to the igniter and check for power. You may have to recycle the power if you have had it on for any amount of time. Often the furnace brain will time out the igniter try for ignition and will not have power to it continually. Also the power will only stay on for a few seconds when it does try, so you need to be ready and watch carefully.

If you are getting power to the igniter and it is not heating up then you have a bad one. This often will only be visible by a fine line of white dust on the surface of the igniter. This is the white line of death for the igniter and indicates a crack in it. Purchase an igniter that is compatible with your furnace or it may heat up too fast or not fast enough to work with your model furnace.

Hopefully this gives a few more tips to help you trouble shoot your gas furnace. As always, be very careful around and handling electrical parts. I have been zapped a few more times than I care to remember!

on Dec 03, 2009 | Heating & Cooling

2 Answers

Electric furnace won't light


tony this is a gas furnance do you seee a orange glow on the right hand side of unit

Jan 22, 2013 | Heating & Cooling

1 Answer

Red light blinking continuosly meanig gas valve relay short how can I fix myself - furnance only blows cold air


You will need to check for 24 volts AC to the gas valve after the igniter starts sparking or glowing. If you have it but it does not open, bad gas valve and you will need to replace it. If you are not getting 24 volts after it starts glowing or sparking, you have a bad board.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Jan 16, 2010 | Heating & Cooling

1 Answer

My Rheem Criterion II gas furnance is not igniting the burner. What can I do to fix this myself?


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Dec 30, 2009 | Heating & Cooling

2 Answers

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)
Blue switch Valve from AC to Heat (hot wire from 24VAC Transfrormer)
Purple prevent starting compressor in Heat pump and furnace in same time

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Rheem tankless water heater wont lite


the system was not sized properly, you need to have a 3/4 gas line to the unit for the volume of gas it needs, the tankless water heaters need to have every bit of gas that is says, it sounds like who ever installed di not make sure you had enough gas comming in the house, you might have to either have a new meter installed or run the gas lind directly from the meter to the water heater and cap off the gas line thats there

May 05, 2009 | Rheem Tankless Hot Water Heater...

1 Answer

Trouble shooting manual for Model# RGUJ-05EA-ER RHEEM GAS FURNACE


replace the gas valve....test for 24volt at the gas valve input.  if you have this then it's a def gas valve relay not working.

Dec 09, 2008 | Heating & Cooling

1 Answer

Furnace will not light


What code is the control board flashing when it tries two or three times? Does it even fire? Does it go straight to fan and lockout?

Dec 09, 2008 | Heating & Cooling

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