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I have a 3400-818 furnace and it doesn't come on. The fan

I have a coleman 3400-818...
I have a coleman 3400-818 furnace and it doesn't come on. The fan works with a override switch but the furnace will not come on with the thermostat?
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: That is the question. If it is the thermostat, easy fix, buy another as this one is a 30 yr old emerson that I can't find trouble shooting techniques for?
JA: Do you plan on doing the work yourself?
Customer: Yes, I fixed aircraft radar in the navy and worked as a tech for IBM for 20 years and am now a part time handyman. Can you give me some hints?
JA: Anything else we should know to help you best?
Customer: Not that I can think of!
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Answered in 23 minutes by:
9/23/2017
Webb-Guy
Webb-Guy, HVAC Mechanic
Category: HVAC
Satisfied Customers: 2,510
Experience: maitenance tech at casto
Verified

Hello, and welcome to JustAnswer. my name is ***** ***** I will be the one to assist you. If its working with the override switch but not with the thermostat then more then likely yes the problem is with the thermostat and its going to need to be replaced.

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Customer reply replied 3 months ago
The override switch as you call it has no wires hooked to it underneath I'm talking about a switch on the wall that is been wired straight to the fan itself just for purposes of turn the fan on for the summertime. So to be clear the override switch is not in play on this furnace as there are no wires hook to the bottom of it it does nothing!

ok so that was my misunderstanding. Have you tried turning off the circuit for 5 minutes to the furnace?

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Customer reply replied 3 months ago
I think it may be the sequencers for my Coleman 3400 - 818 but I haven't been able to find a part number for them can you help with that?

your sequencer part number is *****

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Customer reply replied 3 months ago
The sequences are a guess on my part obviously but would love to know how to measure with a meter to find out for sure? Is that possible
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you can measure it for continuity.

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Customer reply replied 3 months ago
There are many wires hook to the sequencers can you tell me how to which ones to measure continuity on I have the talent to do that just don't know which ones to measure or is there a schematic that will show me that?
Customer reply replied 3 months ago
I have a schematic for a 3400 - 815 but I fear it might be different than my 3400 - 818

I do not have the schematics for this one but here is a helpful video

https://www.youtube.com/watch?v=Za3AyJeG9ow

you should disconnect the wires from the coil terminals and measure the resistance of the coil. This will normally be around 20 ohms. If the reading is zero or considerably higher than 20, you should continue with electric furnace sequencer replacement

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no it shouldn't be any different for measuring this

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Customer reply replied 3 months ago
I will check that and get right back to you.
When you say the coil terminals are you talking about the coil to the right of the sequencers or you talking about coils within the sequencers?

the coils within

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let me know what you find

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Customer reply replied 3 months ago
Okay I'm going to check now

sounds good I am here

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Please note that we here at JustAnswer are on an honor system. I am only credited for my time in the event you rate with 3-5 stars at the top. I do hope that I have earned a 5 star rating from you today. Rating does not stop you from getting back to me in the event you need me.

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Customer reply replied 3 months ago
Okay, small problem, the schematic I have shows h numbers and on my sequencer it shows em numbers so I'm not sure which is which.
Customer reply replied 3 months ago
I could take some pictures and let you see what I am seeing if that will work anyhow on this forum

you can send a picture on here

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Customer reply replied 3 months ago
I'll try and figure out how to do that
Customer reply replied 3 months ago
Going to take pictures now

there should be a little paper clip you can hit and add the picture that way

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they came through one moment please

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the pictures are pretty blurry and hard to get an understanding of the problem. Are you having a problem getting to it to test it?

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Customer reply replied 3 months ago
Okay, I make sure to Christ the high and the low pins on each of you to see and I got three odd numbers like 0 or 1320 $300 so I'm going to assume that sequencers are bad and order the new one.
Can I get a hold of you later somehow let you know what happened or ask more questions? No worries I will give you a good rating

yes you are more then welcome to follow up with me on here even after rating. just bookmark the page and come back to me if and when you need me again. Thats not a problem.

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Customer reply replied 3 months ago
Okay, I think I figured out how to book Market I will order the part get it put in and let you know what was your name?

my name is Travis

Webb-Guy
Webb-Guy, HVAC Mechanic
Category: HVAC
Satisfied Customers: 2,510
Experience: maitenance tech at casto
Verified
Webb-Guy and 87 other HVAC Specialists are ready to help you
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Customer reply replied 3 months ago
I will assume that if I come back to this page it will have your name on it is that correct? If not I'll just try to remember see you soon, goodnight, thank you

yes you just bookmark this thread and it will bring you right back to this conversation also if you put your email address in then the thread should be saved on there from our back and forth.

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Customer reply replied 3 months ago
Thank you, ***** ***** I have it and I gave you a great rating you are very helpful thank you so much for being patient!
Customer reply replied 3 months ago
I am still waiting for the sequencers and will let you know if that fixes the problem. Sorry for the delay!
Dan
Customer reply replied 3 months ago
I put in the new sequencer it did not fix the problem. I'm at a loss as to what to do next if you could help I would really appreciate it. Thank you. Dan
Customer reply replied 2 months ago
I got the new sequencers and put them in but they have not solved my problem I still have no furnace. I have some questions about the sequencers that maybe you can answer there is a bar that connects the left and right side of the sequencer on the bottom and one at the top the one that was in my furnace only had one at the bottom does that make a difference? If not what do I do next?
Customer reply replied 1 month ago
I'm still waiting for an answer to what I can do next with this or is it too late have I waited too long I've tried two different times to send additions to this messaging but haven't received anything back from Travis!
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Webb-Guy
Webb-Guy
Webb-Guy, HVAC Mechanic
Category: HVAC
Satisfied Customers: 2,510
2,510 Satisfied Customers
Experience: maitenance tech at casto

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