Question about Ruud UBHC Air Conditioner

2 Answers

I have a Ruud Achiever 90 plus furnace that will not ignite

I can't get my furnace to ignite and don't know what to check. It was a used furnace so I hav no manual

Posted by on

  • 7 more comments 
  • 3aaamom Jan 18, 2009

    The blower motor stars, but it will not ignite.

  • 3aaamom Jan 18, 2009

    The small inducer blower does come on but the furnace doesn't fire up. We've tried turning off the power switch and waiting several times. By the way this is a propane fueled furnace.

  • 3aaamom Jan 18, 2009

    Many many thanks to both of you for your help, After many times of looking at this, he found thr problems. It was the orange tube. Thank you so much for saving us the cost of a repair visit. In todays economy, it was much appreciated.

  • 3aaamom Jan 18, 2009

    Carldc3 hit the nail on the head. We have igntion and heat.

  • 3aaamom Jan 23, 2009

    carldc3 was a godsend literally. My husband works out of our garage and without that furnace, it was in the twenties. Many many thanks to Carl.

  • carl carpenter
    carl carpenter May 11, 2010

    coming from the induced draft motor is an orange or gray rubber tube leading to a switch pull the end off that is connected to motor and poke a wire or something to insure the hole is not blocked if it is not replace the hose. next step is to check the switch make sure if possible try to jumper 2 wires and turn unit back on if it works then either switch is bad or vent piping is blocked.. For your extreme Safety, Please Do Use Furnace in this condition until problem is fixed. thanks

  • Perry Putnam
    Perry Putnam May 11, 2010

    Need more. Are you saying the main blower or the small inducer blower comes on. What kind of igniter spark or hot surface(glow coil). Have tried resetting the furnace by turning off the power switch for a few seconds?

  • Perry Putnam
    Perry Putnam May 11, 2010

    Does it do anything at all? If so what?

  • wolftrck
    wolftrck Sep 27, 2012

    Hi Carl, first of all I want to thank you for your time here helping people,God Bless, I have a ruud achiever 90 ifc board ok light blinks twice every two seconds, manual say pressure switch, coould this be the same issue, I can hear a relay switch kick in but wont ignite and then the ok light starts blinking.


2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 144 Answers

Again is this a spark or a glow coil? If it is a glow coil look at the coil and see if there is a crack or white spot on it. If so it needs to be replaced.

Posted on Jan 18, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 82 Answers

Coming from the induced draft motor is an orange or gray rubber tube leading to a switch pull the end off that is connected to motor and poke a wire or something to insure the hole is not blocked if it is not replace the hose. next step is to check the switch make sure if possible try to jumper 2 wires and turn unit back on if it works then either switch is bad or vent piping is blocked.. For your extreme Safety, Please Do Use Furnace in this condition until problem is fixed. thanks glad i could help

Posted on Jan 19, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Bought a house with Lennox G12Q3-82-3 furnace. It doesn't look like electronic ignition. A sticker showing AirMedic Electrostatic Air Cleaner says it was installed 10/1992. Doesn't work.

Here's some borrowed info.:
`These are classic symptom of a limit switch opening. Can't guarantee that is what is going on, but here is some things that can cause the limit switch to open:

1) Low air flow. This can be caused by dirty filter, dirty blower wheel, dirty air conditioning evaporator coil, restricted or collapsed ductwork, blower motor running the wrong direction, blower running on too low of a speed, defective limit switch, or a combination of several of these factors. Inspection along with measuring the temperature rise will find most of them.

2) Heat exchanger failure. Split or burned through heat exchanger

3) Over-fired furnace. If you have eliminated everything in section 1 and 2, and the temperature rise through the furnace is still high, you need to check the furnace to make sure it is not burning more fuel than it is designed to burn. If it is a natural gas furnace, you can check the amount of fuel that is being burned by clocking your gas meter.

Here is a link that will tell you how to use your gas meter to calculate the BTU input of your furnace. It should never be more BTU than the furnace's rated input.

The problems you have could be potentially hazardous. If you are not able to aggressively find the problem on your own, you should hire a professional to look at the furnace immediately. The G12 furnace is getting relatively old. If you have never had it professionally inspected (sounds like you haven't), you probably should have a professional look at it immediately.' END QUOTE
This might cover your problem? don-ohio (:^)

Dec 19, 2016 | Heating & Cooling


Carrier Weathermaker 9200 Gas Furnace Error Code 31

A month or so ago, I woke up to discover that I had no heat in my house. I went to the furnace to do a diagnostic check, removed the service door and quickly discovered that there was no flame (visible through the glass peep-hole).

I followed the manufacturer's shut-off procedure, which can be found in the manual, here: When I turned the furnace back on, I saw that the igniter did not glow (should be visible through the same peep-hole - should look like a red-hot, 2-prong tuning fork) and that the red LED error code indicator (visible through the lower peep-hole) was blinking 3 short flashes and 1 long flash (error code 31).

Now what I SHOULD HAVE done was check the pressure switch first (see service manual pg. 3, component #16). By removing the rubber lines that connect tot the pressure switch, one end at a time and both at the pressure switch and the bottom of the igniter box, you may notice some debris in the lines or the male adapters on the pressure switch or igniter box. If you do, clear out the debris with a paper clip (don't insert the paper clip into the body of the pressure switch, though). After checking all connections for debris, disconnect the hose that connects to the top of the pressure switch at the "T" between the pressure switch and the igniter box and blow/suck air in and out of the pressure switch (lightly). If you hear a small click when you pass air in and out, that's the pressure switch functioning. If you hear crackling or you can't blow in/out easily, you probably have a bad pressure switch.

if you are able to make the pressure switch click, connect all lines and start up the furnace per the mfg recommendations. If the furnace kicks on, it was probably a blockage in the pressure switch lines (likely if you found gunk in the lines or male adaptors on the pressure switch), but it may still be a faulty pressure switch (my problem... when I blew in and out to the pressure switch, I could hear the silicone diaphragm cracking). I got mine going, albeit temporarily, by removing the pressure switch and passing air in and out (blowing pretty hard) with my lips on the bottom hose adapter until I could hear the diaphragm crackle free and it became easier to make it click on and off. That only bought me a few days, though. After that, I bought a replacement pressure switch at a plumbing supply place and replaced the old one. If you found gunk in the lines, I would suggest you have your furnace serviced and let the tech know what you found and where.

If neither procedure fixes the problem, it may be the igniter. For some odd reason, this issue started for me about a month ago and I replaced the igniter (YouTube video instructions are easy to find), which fixed the problem. If even that doesn't work, call a local tech, shut the gas off and wait around in some thick blankets! I hope this helped!

on Jan 08, 2015 | Heating & Cooling

1 Answer

Rheem Furnace

do you have a standing pilot or electronic ignition could have a problem with a safety switch, bad electrical connections, electrical short, circuit board issue, hot surface igniter issue....etc...........need to know the type of furnace

Dec 05, 2013 | Heating & Cooling

2 Answers

Furnace repair

By not knowing much, I would think that maybe the gas is coming out, but not igniting. I would also need to know if it is working, and heating up your home. If the it is not igniting, than it would not be working. Something may just be caught in it., be sure to check the filter.

Dec 03, 2013 | Heating & Cooling

1 Answer

Heater not working properly we put on heat it comes up cooler what I have 2 do

This worked for me try and reset your furnace while you're at it change the filter never hurts a furnace in need. My furnace has a switch on/off like a light switch externally however some don't if you have an older furnace you may have to manually light your furnace it would help if you listed your furnace model number. Try and find your furnace owners manual if you don't have it look online or contact company who build it. Also some states in the us don't run gas to homes until a certain time of year. I live in Northern Minnesota so its year round here just wondering if this also could be an issue.

Oct 17, 2012 | Heating & Cooling

1 Answer

Wipers don't work on my 97 ford f150

may hav bad motors or switch---------distributer cap cud be wet or moisture in other parts of ignition------getta repair manual for that model

Jun 20, 2012 | 1997 Ford F150 Regular Cab

1 Answer

I have a Ruud Achiever 90 Plus furnace that will not ignite and is showing a 'soft lockout' code on the LED panel. I've tried restting the furnace as per the manual and still no results. Am I missing...

Hello. a soft lockout typically happens when

1) the flame sensor is not detecting the flame
2) pressure switch fails to close

Since your burners are not igniting I would check the pressure switch, make sure there is no obstruction in the flue pipe, the hose going from inducer to pressure switch is not kinked, loose, obstructed, or have water in it. If that all checks out good then your pressure switch is bad and must be replaced. If you need any further assisatnce let me know

Mar 09, 2011 | Heating & Cooling

1 Answer

Blower on colman gas furnace will not come on. (have no gas yet)

I'm not a furnace technician. But I have worked on several Coleman trailer furnaces. So keep in mind that my terminology might not be exactly correct. But I think I can help you.

I don't know what model you are running, but most of them run pretty much the same. You have a four basic components to check. Thermostat; Ignition Control Module; Pressure Switch; and which ever of the following that you have (Glow plug, Electronic ignition, Pilot Light).

I'm assuming that you are referring to the blower as the "Rat wheel blower" (round wheel looking thing with fins on it). If my assumption is correct and if the power from the breaker box to the furnace junction box (Probably with a on and off switch on top or side), than when you give it power (from breaker box and turn thermostat up) the fan (not blower) comes on. If it doesn't there is a probably a problem with your Thermostat or Ignition Module. If it does come on and your glow plug or you igniter tries to work. Than yes, you are correct, you have to have gas pressure to let the pressure switch know that there is adequate gas supply pressure (gas- 5 to 7 W.C, propane 11 to 13 W.C). The reason for this is if the Pressure Switch doesn't feel the correct pressure. It thinks you have a leak and won't release gas for ignition. After you turn the gas on. If the furnace doesn't ignite. Make sure the Thermostat is definitely wired properly. Now we are down to one of three problems. If the Glow Plug, Electronic Ignition, or pilot light are working properly. Than we are down one of two problems. The Ignition Module or Pressure Switch. Check pressure on the Pressure Switch. If yuou don't smell gas it is probably OK. But it is best if you use a manometer. I have rarely found Pressure Switches bad. Normally if I get to that step. It is the Ignition Module. The Ignition Module kind of like the brain of the furnace. It is located behind one of your front panels. It will have approximately 10 wires going to it. Some will be going to the Thermostat, some to the Glow plug (Igniter), some to the Pressure Switch, and some going to the blower.

I have probably said more than you need to know. If I did I apologize. But to wrap it up. You were probably correct. You definitely need gas for the blower to kick on. The furnace has to light and heat up before the blower will Start. Not to keep rattling, but to check to see if the blower motor will run. Is to switch the Thermostat from "auto" to "run".

Good Luck

Nov 17, 2008 | Coleman Propane Forced Air Heater...

5 Answers

Rheem-Gas Furnace

It may be a little difficult to diagnose if you don't have a volt/ohm meter to check the switches with, but I will try to help what I can.

The first thing to check is the pressure hose from the vent fan to the pressure switch. Make sure there is no hole rubbed in it and make sure the connector on the fan shroud is clear. Stick a piece of wire in it to make sure a dirt dobber has not clogged it up. Blow in the hose and listen for the switch to click. If there are only 2 wires on the switch, use a piece of wire to jump across them and that will take the switch out of the system. This will tell you if the other parts are working properly.
Post back with what you find and I will try to help. I don't have a digram in front of me, just working from memory, so please be patient.

Nov 26, 2007 | Heating & Cooling

Not finding what you are looking for?
Ruud UBHC Air Conditioner Logo

3,057 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ruud Heating & Cooling Experts

Donni Steen

Level 3 Expert

659 Answers

Bill Long

Level 3 Expert

587 Answers

Tim Whalen

Level 3 Expert

3072 Answers

Are you a Ruud Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides