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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22312
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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You helped me last night and the heat quickly worked great

Customer Question

Hi again! You helped me last night and the heat quickly worked great throughout the night! Came home this afternoon and itsdoing the same thing.. cycling on and off..I am so frustrated., I'm a first time homeowner.. ( have only been here two months) and have never had to encounter issues like this before..
Submitted: 4 months ago.
Category: HVAC
Expert:  BillyHvac replied 4 months ago.

Hello,

My name is ***** ***** I will do my best to assist you. I am looking over your question now and will respond shortly.

Expert:  BillyHvac replied 4 months ago.

was this were you cleaned the sensor rod with steel wool?

Expert:  BillyHvac replied 4 months ago.

if so.....this time you would need to use a vacuum attachment and clean out the burners and tap them sharply to get any rust out....sounds like the issue is flame getting to the rod in time...

I am going offline but will be back online in aprox 30 minutes.

Customer: replied 4 months ago.
Ok.. I will clean and see what it does from there
Customer: replied 4 months ago.
I did what you said.. and same thing..did I do something wrong? Did I put the sensor rod back in wrong? It worked fine up until this afternoon??
Expert:  BillyHvac replied 4 months ago.

DO YOU GET FLAME FOR 3 SECONDS

Customer: replied 4 months ago.
I can't see much but I do t think I got any flame
Expert:  BillyHvac replied 4 months ago.

during the ignitor glow...watch and see if flame lights all across..it must hit that metal rod in 3 seconds

Customer: replied 4 months ago.
The metal rod that I cleaned? Correct?
Customer: replied 4 months ago.
When I put the metal rod back in.. it's shaped like an L.. it goes towards the left.. but the burners are at the right? Did I reinstall correctly?
Customer: replied 4 months ago.
I see no glow at all., fan runs for about 20 seconds.. then shuts off
Expert:  BillyHvac replied 4 months ago.

ok put rod so it is in front of the burner...

do you still get the same code with light blinking?

Customer: replied 4 months ago.
Same code yes. And there are 3 burners from what I can tell and the rod is in front of it
Expert:  BillyHvac replied 4 months ago.

was the last couple days the first time furnace has run this season?

Customer: replied 4 months ago.
before that I don't know because I just bought the house 2. Months ago
Customer: replied 4 months ago.
It worked fine after I cleaned the sensor last night like you said. And now nothing
Expert:  BillyHvac replied 4 months ago.

ok....do you know what the gas valve is?...the gas pipe comes into the side of the furnace and then goes into a blocky looking gas valve and then pipe comes out other side and goes to burner...

Customer: replied 4 months ago.
I think. There is an on/ off switch on it?
Customer: replied 4 months ago.
Is this it?
Expert:  BillyHvac replied 4 months ago.

correct...hold your hand on that...start furnace...then tell me if you feel that valve click within 60 seconds

Customer: replied 4 months ago.
It clicked twice as soon as I turned it on
Expert:  BillyHvac replied 4 months ago.

I see you said it was 3 blinks now?

So the exhaust fan starts....then stops after 20-30 seconds?

Customer: replied 4 months ago.
Correct
Customer: replied 4 months ago.
It was 3 blinks last night too
Expert:  BillyHvac replied 4 months ago.

do you still have the pics available so I can point out some other items for you?

Customer: replied 4 months ago.
donu need more?
Expert:  BillyHvac replied 4 months ago.

ok,

the vent pipe that carries the exhaust outside...is it plastic pipe out the side of the house?

do you have a shop vacuum?

Customer: replied 4 months ago.
I would guess its plastic ..but its dark and rainy and windy out side at the moment .. when I locate it tmrw.. what should or could I do to get this working again?
Expert:  BillyHvac replied 4 months ago.

if you have time I want to do another test first...

Customer: replied 4 months ago.
if I let this go tonight, can I recontavt you tmrw after I get off work?
Customer: replied 4 months ago.
I have time right now.
Expert:  BillyHvac replied 4 months ago.

ok see this pic

remove the 2 wires...

get a small nail that fits into the little connector on the end of the wire.

Hold the 2 wires apart

start furnace

as soon as the exhaust fan starts connect the 2 wires by sticking the ends of the nail, staple or paperclip into the ends of the wires thus connecting them.

We do this AFTER the exhaust starts.

Tell me what happens after this test

Customer: replied 4 months ago.
Ok gimme a sec
Expert:  BillyHvac replied 4 months ago.

standing by....you are certainly getting heating 101 the last couple days..

Customer: replied 4 months ago.
Right?! Lol.. maybe I should change jobs
Customer: replied 4 months ago.
Omg!! It's on!!
Expert:  BillyHvac replied 4 months ago.

ok take wires apart and I will bring you up to speed..

Customer: replied 4 months ago.
Ok
Customer: replied 4 months ago.
Is it bad??
Expert:  BillyHvac replied 4 months ago.

This means there is:

Air restriction in the vent pipe..nest, toy etc..

Drain line from furnace plugged. You will see a drain come out of the furnace and go to a drain or pump..

Use the shop vacuum to clear the plastic pipe...and to suck the drain line clear.

The air circulates through the furnace when that fan kicks on...anything that impedes the flow affects the pressure switch, burners etc.

So now we know the flame sensor is clean...now we clean out the vent pipe and drain...

This is good news...just a pain..

Billy

Expert:  BillyHvac replied 4 months ago.

sounds like the furnace sat dormant for a while....

Customer: replied 4 months ago.
Do., vent pipe outside., .. the pipe that drains in the floor.. use a shop vac on those tmrw? And it did sit dormant.. it was a warm winter here last year.. so probably didn't use it much., but do you think after those things I do it MAY be ok?
Expert:  BillyHvac replied 4 months ago.

yes...these are basic things that happen when a furnace sits for extended periods unused....especially the vent pipe being obstructed as it is a perfect spot for bird or rodent nest....they leave when the furnace starts but the nest remains..

I am confident once you have these things cleared you will be ok.

Customer: replied 4 months ago.
Ok.. I will do this tmrw after work! Can I leave this open tho in case I have any more questions?
Expert:  BillyHvac replied 4 months ago.

certainly....just do not respond to this message...or the system forces a response from me...just hold this until tomorrow after you find out how it goes...

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