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I am having a problem with having furnace blower constantly

Customer Question
Hi I am having a...
Hi I am having a problem with having furnace blower constantly running
JA: Did you check the furnace's filters?
Customer: yes i just cleaned them - it's Honeywell electrionic air cleaner system should i look into replacing cell as well?
JA: Do you plan on doing the work yourself?
Customer: yes. i just replaced thermostat as well. was thinking that was the issue.
JA: Anything else we should know to help you best?
Customer: no
Submitted: 12 months ago.Category: HVAC
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Answered in 2 minutes by:
11/26/2016
HVAC Technician: airheatman, HVAC Technician replied 12 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,520
Experience: Furnace, A/C and heat pump specialist.
Verified

Issue is most likely a bad relay on the furnace control board.

Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel

http://i.imgur.com/U8b0GXT.jpg

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Customer reply replied 12 months ago
Its Rheem - cant locate model #. should I send you pic?
Customer reply replied 12 months ago
its RHEEM - RGD-J-12EARJR
Customer reply replied 12 months ago
air filters may be an issue as well. First time home owner and not sure if Honeywell electrical air cleaner needs replacement - either filters or the cell. also filters are only installed on one side of the unit. the side that pumps the air into the vent -> other side is open into HVAC unit. sounds right? or should i have filters on both sides?
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Does both heat and cool work and cycle normaly other than indoor fan just keeps running?

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Customer reply replied 12 months ago
i havent tested cool yet, getting cold in Chicago but yes - heat cycles normally and responds to themoset
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

OK a mentioned.I suspect relay stuck on board. Lets do this, Remove the thermostat wires from furnace control board,then hold door switch in and see if blower comes on .

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Customer reply replied 12 months ago
All the thermostat wires? all 5 of them?
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Yes what we want to do is make sue there is no external issue outside of the furnace that is telling blower to run

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Customer reply replied 12 months ago
done. blower stills turns on despite having thermostat wires being removed from circuit of HVAC board
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

I suspected it would.If furnace heats properly except for blower not shutting off, you are going to need to replace the control board.You will see a couple of small black boxes on control board.These are the relays that tell the fan to come on in heat or cool speeds. The contacts are stuck closed and not releasing after call for heat is satisfied.

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HVAC Technician: airheatman, HVAC Technician replied 12 months ago

There should be a part number on control board beginning with 62-. You can Google that part number to locate a replacement board and this will solve your problem.

If you have further questions, please let me know.

Thanks for letting me work with you.If my answer has been polite, professional,and thorough, please click one of the ratings before you go. If you still need help let me know!.Expert is not paid for assisting you until you rate answer.Feel free to follow up for 30 days at no additional cost. Bonus always appreciated if you feel justified.

To rate answer, please select one of the stars on the page.

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Customer reply replied 12 months ago
is there a harm if I just let this darn fan on? or should I look into replacing soon? Is it easy to replace by myself? Any recommendations on where can I order this part from or pick up (ideally?)?Just want to make sure that attached picture is what need to be replaced. THanks for your help!
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Yes that is the culprit.It wlll not hurt anything to leave as it is other than when furnace cycles, it will blow cool air

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HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Let me see what I can find on a replacement

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Customer reply replied 12 months ago
appreciate it. I cant find any part # that starts with 62. :(
Customer reply replied 12 months ago
Serial EB5D307F439608873
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Thanks. Be right with you

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Customer reply replied 12 months ago
Last question - would you suggest that I attempt to replace by myself? I was able to replace thermostat and install Ecobee easily if that tells you about my comfort.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

You absolutely can replace yourself. My suggestion is to remove the plastic clips holding board in place, lift it up and put new board in place without removing any wires.Then replace one wire at a time so as not to get anything crossed up.

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Customer reply replied 12 months ago
Would you approve me buying this for replacement? https://www.amazon.com/62-24268-01-Rheem-Replacement-Furnace-Control/dp/B003U4MGBY
Customer reply replied 12 months ago
you are a wonderful help! i appreciate it. I almost ordered safety fan relay switch before contacting you as it thought it was culprit.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Absolutely,That is actually an oem replacement.Your current board is replacement board, not oem.That is why you could not find the 62- part number it is a heaper board (Probably an ICM board)

B the way these are the relays I was referring to that one is sticking.

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HVAC Technician: airheatman, HVAC Technician replied 12 months ago

That is why I like to ask questions and do a bit of troubleshooting before just telling you to change parts.If the limit switch were casing fan to stay on, heat would not work properly and we would get a flash code on the board

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Customer reply replied 12 months ago
Awesome. thanks I will go ahead and order Amazon and will let you know if that worked!
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Sounds great.We are here to help. You can return to question for up to 30 days after rating to follow up at no additional fee.

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Customer reply replied 12 months ago
Btw - I am so sorry. Happy to pay you more but looks like the part on Amazon isnt compatible. See attached picture. In current board, i have a 12 pins socket and I dont see that from picture on Amazon. Do we have wrong part #?
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Hmm this is the correct board for the furnace based on model and serial as you can see in the links I sent.AS I mentioned, the current board does not appear to be original. Look and see if maybe there is an adapter from the 8 pin on current board that mat connect to the original 12 pin

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Customer reply replied 12 months ago
as you can see in adapter of 12 pin - 3 of them are empty... that tells me that part is right but then i need to order 9 pin adapter and how do I insert? Which cables goes in which pins? heavens are busy raging against me.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Hmm, All of my resources are showing the 9 pin bard. There is no adapeter ther where they converted before huh?

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Customer reply replied 12 months ago
no.. straight into 12 pins adapter with 3 holes ( pins) empty as I sent you in pic.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Give me a few minutes to see what I can find out

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HVAC Technician: airheatman, HVAC Technician replied 12 months ago

I am thinking some things have been changed on the furnace from original factory oem. Let me ask this.Has the furnace been doing fine and operating properly with this board until the issue with fan not shutting down?

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Customer reply replied 12 months ago
to be honest with you, this issue has persisted over 2 years since we moved into this house.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Since we are not sure what may have been changed, I think I would go back with the board that is currently there. Looks like they have used the universal S9200U1000,

It is actually a little cheaper too,

https://www.amazon.com/Honeywell-S9200U1000-Universal-Ignition-Integrated/dp/B003CVV4W2

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HVAC Technician: airheatman, HVAC Technician replied 12 months ago

That is if you remember a time when this board worked properly and fan cycled correctly.

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Customer reply replied 12 months ago
since i dont ever remember having fan turned off since we bought this house, the board that you are suggesting may not work?
Customer reply replied 12 months ago
you are spot on. that is the currently installed board.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Wow. I hate to have you order a board and it still not work.If that board never allowed fan to shut down a new one like it would not either. THis is the problem with trying to troubleshoot expecting things are original. Lets take a look at a couple of things.

Do you see some dip switches that are changeable from off to on on the board?

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Customer reply replied 12 months ago
I cant locate dip switches. still looking.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

I am beginning your best bet may be to locate a local Rheem dealer and pay the price to get the proper board and wired properly rather than buying a new board not knowing what has been changed. You can find a local Rheem dealer by entering your zip at this link.

http://www.rheem.com/contractors.aspx?PostalCode=30303&Distance=25&HeatingAndCooling=1&ResidentialWaterHeaters=1&CommercialWaterHeaters=1&TanklessWaterHeaters=1&SolarWaterHeaters=1&HomeGenerators=1&PoolAndSpaWaterHeaters=1

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HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Just to see if it makes a difference set the S1 switches as follows

SW1: ON SW2: OFF SW3 & SW4: 60

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HVAC Technician: airheatman, HVAC Technician replied 12 months ago

And on the S2 switches make sure both are ON

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Customer reply replied 12 months ago
I cant tell which switches are on and off and certainly cant tell about setting them to 60
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

I dont think it will make a difference .They are just time delays, but fan is not cutting off at all.

The person who installed this board no doubt moved the wires from the 9 pin harness of rather than use the adapter.

You might be cheaper in long run to get a Rheem dealer to straighten out and correct

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Customer reply replied 12 months ago
awesome.. thanks for your help! you are a trooper. have a good night.
HVAC Technician: airheatman, HVAC Technician replied 12 months ago

Well we know the reason fan does not cut off is because of wrong board or bad board.Glad you noticed that 12 pin though as the adapter would not come with an oem board

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airheatman
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,520
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Experience: Furnace, A/C and heat pump specialist.

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