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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8172
Experience:  Furnace, A/C and heat pump specialist.
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I have a rudd deluxe 90 plus furnace (ugeb-06ec-fs) and the

Customer Question

i have a rudd deluxe 90 plus furnace (ugeb-06ec-fs) and the pilot lights but the burners never ignite. I was told it might be the flame sensor so I purchased one but i cannot locate the part on the furnace. any ideas?
Submitted: 8 months ago.
Category: HVAC
Expert:  airheatman replied 8 months ago.

Flame sensor will not come into play until after burners light.If it is dirty burners will light and go back out. Look on control board and tell me if you get an error code Maybe 2 blinks then pause.

Customer: replied 8 months ago.
The burners don't light at all, the pilot lights fine and stays lit.
Customer: replied 8 months ago.
Where's the control board?
Expert:  airheatman replied 8 months ago.

Flame sensor not the issue then

Customer: replied 8 months ago.
what do you think it could be?
Expert:  airheatman replied 8 months ago.

Mounted on blower housing.You will have 2 green lights and an amber. Probably a pressure switch problem

Customer: replied 8 months ago.
Is this it?
Customer: replied 8 months ago.
Trying to send a phito
Expert:  airheatman replied 8 months ago.

If you have a paper clip icon on your page you can attach using that link.Or

You can upload the pictures using the tiny pic site .

Here is a link to the site.

http://tinypic.com/

Click on Browse , select the file from your folder.then click UPLOAD NOW.

They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW

You will see your picture on right side of screen.

Then copy the link URL for email & IM

Paste that link here on the site.

Customer: replied 8 months ago.
Did you get the picture?
Expert:  airheatman replied 8 months ago.

Not yet

Customer: replied 8 months ago.
Picture
Expert:  airheatman replied 8 months ago.

Give me a minute, THis is one of those furnaces they only built for about two year.Lots of issues with the board

Customer: replied 8 months ago.
Ok. Thanks.
Customer: replied 8 months ago.
The ignition control model number is ***** by robertshaw controls
Customer: replied 8 months ago.
The people who lived here last winter said it worked fine.
Expert:  airheatman replied 8 months ago.

Yes I am seeing that. Troubleshooting guide says check for 24v at valve (Between terminals) Do you have a volt meter to do so?

Customer: replied 8 months ago.
Let me go get it. You'll have to elaborate on test location though.
Customer: replied 8 months ago.
Ok. Got the meter.
Customer: replied 8 months ago.
Where's the test points?
Expert:  airheatman replied 8 months ago.

No problem. There should be 2 wires at gas valve.When igniter lights after about 5 seconds check between those terminals.

If no 24v at valve check for 24v across the terminals on the HS780 marked VALV and GND.

If we have 24v at valve (Valve is bad)

If no 24 v at valve check board

If not 24v between VALVE and GN replace board

Expert:  airheatman replied 8 months ago.

HERE IS A DIAGRAM SOULD MAKE IT EASIER>

Customer: replied 8 months ago.
Ok, I understand all of that and see where it is with the exception of step one, where's the gas valve? The thing the gas line is running into?
Expert:  airheatman replied 8 months ago.

Yes gas supply connects to valve and it is mounted on burner manifold.If you have a pic I can show you where to check

Customer: replied 8 months ago.
Here's a pic.
Expert:  airheatman replied 8 months ago.

WE should get 24v between yellow and blue wires.

Customer: replied 8 months ago.
Pilot is lit and I'm showing 24.6 volts between yellow & blue
Expert:  airheatman replied 8 months ago.

Are you sure you have gas to furnace?

Customer: replied 8 months ago.
the pilot is lit right now.
Customer: replied 8 months ago.
The far right burner where the ignitor is is lit and stays lit, but nothing else happens.
Expert:  airheatman replied 8 months ago.

OK you have a bad gas valve. Look on valve and tell me if it is the Honeywell VR8204 or the Robertsahw 7200

Customer: replied 8 months ago.
Can you explain to me, which one of these gas lines supplies what?
Expert:  airheatman replied 8 months ago.

OK wait a minute, I did not think any burners were lighting.If one lights you may sill have a bad valve (low pressure coming out) or burners and orifices may just be stopped up.

Customer: replied 8 months ago.
Robertshaw 7200
Expert:  airheatman replied 8 months ago.

This is pilot tube. Main burners are fed through 1/2" steel manifold tube.

Does the one burner appear to a be strong flame?

Customer: replied 8 months ago.
Well, I guess I don't know what the difference is between a pilot and a burner on this unit? Here's a picture of what's lit.
Customer: replied 8 months ago.
Weak flame for sure.
Expert:  airheatman replied 8 months ago.

I would start by removing burners and cleaning them.This furnace is about 27 years old. Personally I would recommend having and inspection of heat exchanger done before investing in a gas valve.Life expectancy of these were about 15 years

Customer: replied 8 months ago.
Ok. I'll pull the burners quick. Is it possible to contact you after I do if I need to?
Expert:  airheatman replied 8 months ago.

Absolutely you can come back to question for up to 30 days after rating to follow up at no additional charge