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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22109
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: 1 month ago.
Category: HVAC
Expert:  BillyHvac replied 1 month 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 1 month ago.

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

Expert:  BillyHvac replied 1 month 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 1 month ago.
Ok.. I will clean and see what it does from there
Customer: replied 1 month 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 1 month ago.

DO YOU GET FLAME FOR 3 SECONDS

Customer: replied 1 month ago.
I can't see much but I do t think I got any flame
Expert:  BillyHvac replied 1 month ago.

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

Customer: replied 1 month ago.
The metal rod that I cleaned? Correct?
Customer: replied 1 month 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 1 month ago.
I see no glow at all., fan runs for about 20 seconds.. then shuts off
Expert:  BillyHvac replied 1 month ago.

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

do you still get the same code with light blinking?

Customer: replied 1 month 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 1 month ago.

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

Customer: replied 1 month ago.
before that I don't know because I just bought the house 2. Months ago
Customer: replied 1 month ago.
It worked fine after I cleaned the sensor last night like you said. And now nothing
Expert:  BillyHvac replied 1 month 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 1 month ago.
I think. There is an on/ off switch on it?
Customer: replied 1 month ago.
Is this it?
Expert:  BillyHvac replied 1 month ago.

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

Customer: replied 1 month ago.
It clicked twice as soon as I turned it on
Expert:  BillyHvac replied 1 month ago.

I see you said it was 3 blinks now?

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

Customer: replied 1 month ago.
Correct
Customer: replied 1 month ago.
It was 3 blinks last night too
Expert:  BillyHvac replied 1 month ago.

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

Customer: replied 1 month ago.
donu need more?
Expert:  BillyHvac replied 1 month 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 1 month 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 1 month ago.

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

Customer: replied 1 month ago.
if I let this go tonight, can I recontavt you tmrw after I get off work?
Customer: replied 1 month ago.
I have time right now.
Expert:  BillyHvac replied 1 month 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 1 month ago.
Ok gimme a sec
Expert:  BillyHvac replied 1 month ago.

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

Customer: replied 1 month ago.
Right?! Lol.. maybe I should change jobs
Customer: replied 1 month ago.
Omg!! It's on!!
Expert:  BillyHvac replied 1 month ago.

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

Customer: replied 1 month ago.
Ok
Customer: replied 1 month ago.
Is it bad??
Expert:  BillyHvac replied 1 month 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 1 month ago.

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

Customer: replied 1 month 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 1 month 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 1 month 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 1 month 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...