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I have a TRANE BLU055E936B1 Gas Fired Air Furnace. My heat

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stopped blowing last night. The...
I have a TRANE BLU055E936B1 Gas Fired Air Furnace. My heat stopped blowing last night. The Thermostat is working properly. The gas in on and pilot is ignited. I removed the fan blower door and manually pressed the blower door switch. The switch clicks and ignited the furnace once, but once I released it that time, it would not re-ignite. Is this most likely a failure with the door switch or something more? This happened in late fall but I assumed the door switched had slipped under the door frame, once I played with it a couple of times it ignited the furnace and has worked until last night.
Submitted: 7 years ago.Category: HVAC
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Answered in 9 minutes by:
1/11/2010
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,756
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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You are correct. I also commend you for realizing and recognizing the function of door switch. If it becomes too troublesome you can bypass until you get a new switch.

 

Obviously it is a safety feature for when the bottom door is removed to cut power.

 

I wish you luck

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Customer reply replied 7 years ago
I have bypassed the blower door switch. Should the furnace ignite imediately? Furnace has not ignited now for well over an hour. What should I do next? Tranformer? Gas Valve 36C03 Type 222? Clean pilot ignition?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

I apologize...computer troubles...

 

Clean all the rods and metal components of ignitor with steel wool, reset power and see if cycle improves

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Customer reply replied 7 years ago
I was able to wire brush the thermocouple senser using a small brass brush. I lit the pilot and turned the system on. The pilot is burning just fine. Still no gas released to the burners though. Does this mean I need to replace the gas valve or is there more to check? Is the thermocouple causing the problem? If pilot is lit, thermocouple is working properly, no?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
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Customer reply replied 7 years ago
No. Looks like this one and connects directly to the top of the Gas Valve 36C03 type 222.

http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=PIL2400&Category_Code=P

HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
This valve has 2 terminals under the thermocouple fitting that run to a safety. Follow the 2 wires from under tcouple fitting and tell me what they run to.
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Customer reply replied 7 years ago
The wires run to what looks like a sensor into the sheet metal. I removed it and it has a copper loop on the end. The plate reads General Electric and 415º with a long part no.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
Remove the wires from it and touch them together
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Customer reply replied 7 years ago
Do you mean to remove the wires from the terminals and cross connect the terminals with say a screw driver?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
that works also
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Customer reply replied 7 years ago
I removed the wires from the terminals. The pilot went out, immediately. I touched a screwdriver to both terminals connecting them and had no reaction.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

Good, at least now we know the limit and thermocouple are good. Do you have a meter to check 24v at the gas valve?

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Customer reply replied 7 years ago
No. no voltage meter. Once I have one what should I do? I will run and buy another, I'm sure my stepson or ex-wife has mine.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

you will check for 24 to the gas valve terminal...one meter lead to ground and the other to th on valve.

 

24v on th with no burner = bad gas valve

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Customer reply replied 7 years ago
I performed the meter reading. Make sure I did this properly. I placed the black (-) lead to the body of the gas valve and the red (+) lead to the th terminal (left of center terminal). I used ACV setting of 50 on the GB instruments GMT -312. This is a needled meter not digital. Should have purchased digital. The needle moved and held slightly at 2 marks off 0 (zero). I want to say that's definitely less than 24. Note, I did not lite the pilot, nor did I replace the two wires to the terminals removed a step or two ago.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

sorry for delay...my regular job needed my attention.

 

Now take the blower door off and tape the switch down again. Find the white wire coming from the thermostat and tell me what it goes to in the furnace.

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Customer reply replied 7 years ago
I believe I made a mistake when metering the Gas Valve. I changed my placement of the black lead and placed it into the black wire wire-nut connecting the power to the furnace and the red (+) lead to the th terminal (left of center terminal). The meter read 24 when I metered it in those locations. Doing this wrong? When I placed the black on the ground wire coming into the furnace and then the red to the th terminal it read maybe 5-10.

The white wire from thermostat? Is the the white wire running with 4 others green, red, yellow and blue?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
correct, the white with the colors you described. Does it run through the limit?
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Customer reply replied 7 years ago
It connects by wire-nut to a heavier wire with inline fuse to the th terminal on the gas valve.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

Great, that is what I wanted....now put red lead to TH and black lead to cabinet while thermostat is calling for heat.

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Customer reply replied 7 years ago
Do I first remove white wire from th? Black wire to cabinet? Cabinet meaning the furnace itself?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
Leave white to TH and black meter lead to furnace cabinet
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Customer reply replied 7 years ago
Meter needle is barely moving to 5 - 10
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

lets leave the black lead on the side metal of the gas valve, no paint and conductive.

 

Now move the red lead to the white wire coming from stat. Unhook from wire nut and test the wire direct.

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Customer reply replied 7 years ago
The meter read maybe 15.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

go to thermostat and remove top section. Take R wire and W wire and twist together. Metal to metal.

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Customer reply replied 7 years ago
Done. So far nothing happening. It's been about 5 minutes
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
Take apart red and white and put a meter lead on each wire
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Customer reply replied 7 years ago
Done. Almost nothing maybe 5.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

we need to bypass the door switch and make sure power is going to furnace. The red wire should have 24 volts at all times. We are missing power somewhere

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Customer reply replied 7 years ago
Done. Bypassed the door switch. What next? read red and white wire at thermostat again?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
Correct
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Customer reply replied 7 years ago
Done. when I place the black meter lead on white and Red on red or vice versa the meter reads barely anything. When I place the black to the black ground and and red to red the meter reads a tad more than 25V. Sorry I do not work with electricity often or even some.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

Now hook all back up.

 

so red wire to ground got us 24v. Pull the TH wire from gas valve and measure it to ground the same way. I know we did this before but it was missing last time

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Customer reply replied 7 years ago
My apologies. The one step back. It was not a black wire at the thermostat is was a green wire. It's connection on the thermostat is marked with a G and there is black electrical tape close to the end.

I re-connected the thermostat. I took the th wire from the gas valve and touched the black lead to the galvanized metal cabinet and red lead to th, resulting in low meter reading. I then touched the black lead to the incoming ground wire, (black, white, ground - power source) and red to th, resulting in the same. I then touched the same thermostat green wire and red lead to th, resulting in 24V.

Gotta call it a night. How do I resume tomorrow?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

Ok now that your familiar with the meter a bit more....

 

all the thermostat wires come into the furnace. Do they all just connect to other wires or do any mount on a control board?

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Customer reply replied 7 years ago
They connect to other wires. I have two groups of wires coming into the unit other than the main power supply wire. One from the thermostat and I don't know about the other.

Once connected by wire-nuts to other wires some connect to post of terminals (see photos)

graphic

1st group
Colors are red, yellow, lt blue, white and green.
yellow not used

2nd group
Colors are dark blue, white and red.
dark blue not used

graphic

some sort cylinder connected to this, hard to see in photo.






HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

excellent, the cable with 5 wires comes from thermostat, the cabel with 2 wires goes out to the outdoor ac unit.

 

The white wire in the cable with 2 wires is know as common. The red takes 24v out to the ac unit.

 

The white wire in the 5 wire cable is the one that goes to the gas valve on TH right?



Edited by Billy on 1/12/2010 at 4:18 PM EST
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Customer reply replied 7 years ago
Yes
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

Great, thermosta hooked up, heat turned up, power on. Remove TH wire from gas valve. take wire nut off the white wire in the 2 wire cable but leave twisted together.

 

Red meter lead to TH wire removed from gas valve and black lead to white wire in 2 wire cable.

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Customer reply replied 7 years ago
Sorry for the delay. I did what you instructed and the needle did not move at all.

HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
that means no power is getting to the valve. Can you see if 24 v is at the red wire in 5 wire cable
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Customer reply replied 7 years ago
Black lead to Red Wire and Red Lead to th terminal?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
Sorry, black lead to the 2 wire cable white. Red lead to red wire
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Customer reply replied 7 years ago
Yes, 24V
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

And not to beat a dead horse...but the white wire from the thermostat goes direct to TH on gas valve?

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Customer reply replied 7 years ago
Yes, however it is connected by wire nut to another white wire connected by wire nut to another white wire with and inline fuse connected to th.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

I understand...check the inline fuse

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Customer reply replied 7 years ago
Looks to be okay when shining light through opposite side, I don't see any breaks, but there is some amber discoloration to one end of the fuse. The fuse looks like this one.

http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=FUS0283&Category_Code=F
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

Take the fuse section out of the equation and have white wire go direct to TH.

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Customer reply replied 7 years ago
OMG...Burner came on immediately
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
Excellent, gosh I am glad you have patience!
BillyHvac
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Customer reply replied 7 years ago
Thanks very much. You know I have a friend that works does this stuff for a living, some 25 years now, but he is always working late and I decided I wanted to learn a little something. Thanks for your patience. Have a great week.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

Well done. I thank you

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