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In need of help troubleshooting Carrie 8000 ts. I turn on

Customer Question
In need of help troubleshooting...
In need of help troubleshooting Carrie 8000 ts.
I turn on heat switch and blower turns on, but no heat.
Submitted: 2 years ago.Category: HVAC
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Answered in 3 minutes by:
10/31/2015
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,528
Experience: Furnace, A/C and heat pump specialist.
Verified

Look on blower housing for control board and see if we have a light flashing.If so tell me the pattern of the flash as that will tell us where to start troubleshooting

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Customer reply replied 2 years ago
LED is constant
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Does it change when furnace fails to light? It should give us an error code such as two short flashes followed by 2 long flashes

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Customer reply replied 2 years ago
no. LED remains solid. The fan/blower almost immediately turns on.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Does fan stay on or run for 90 seconds and shut off?

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Customer reply replied 2 years ago
the fan will run indefinately. I have to turn off the heat.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Does the little vent motor ever come on? If not do you have ammeter to see if it is getting power on call for heat?

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Customer reply replied 2 years ago
no. it does not. I have a meter. tell me where to check for power
Customer reply replied 2 years ago
I dont know if it makes a difference,but this unit has another thermostat connected to it as well
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

You may have a zone system if you have two thermostats, but we still should get heat if this is the main thermostat.I actually have a phone call and need to step away.I will open to other experts while I am gone and will check in when I et off phone.

I have opted out of the question to see if perhaps other experts may have more information and can assist.Please do not rate or reply as that will send question back to my desk. Please stand by to see if another expert can assist further.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK I am back. Can you get a volt meter so we can do some troubleshooting? The firdt thing that has to happen is we have to get power to the vent inducer motor.

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Customer reply replied 2 years ago
ok. I have a meter. Which wires do I test?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Let me know when you are online.

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Customer reply replied 2 years ago
It will be tomorrow afternoon. I have to work. Thanks so far
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Tomorrow afternoon is fine.

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Customer reply replied 2 years ago
I'm ready when you are
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Ok on furnace control board where thermostat wires hook up, do you see a C and an R terminal?

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Customer reply replied 2 years ago
I have a control board. I can see that it calls up the heat and the blower. I realize that the control board connects up to the furnace board. I'll open the panel and locate them.
Customer reply replied 2 years ago
Holy smokes! There's a half million wires! I believe I have it located.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK what I want you to do is this.first make sure we are getting 24 volts between that R and COM on board.I feel sure we are but want to verify.

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Customer reply replied 2 years ago
OK. Tested it and am getting 24 v
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Excellent. Next I want you to unplug the wires at the little inducer vent motor. Put meter probes into the connector that you unplugged from motor. Power off then back on to reset board. Then call for heat and see if we get 120v at the plug. (Door button of course needs to be in or panel in place to hold button in.)

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Customer reply replied 2 years ago
far no voltage. I unplugged the motor (has a red, black, and white wire). I placed the probes into the plug making contact and get no reading (this is with the heat and blower called and door switched in the operating (closed position)
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

But error light is staying solid?

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Customer reply replied 2 years ago
error light stays solid green which states that it is receiving 24 volts
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK on call for heat, the board checks low heat and high heat pressure switches to verify they are open. If so, inducer should start.If not we should get either a 31 or 32 error code.

Lets do this. On furnace control board lets jumper R to W and see if inducer will start.

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Customer reply replied 2 years ago
Ok. have jumper wire and turned heat on. the blower came on. I have no idea how to interpret the LED but it has a long blink, then a second or so pause then 2 quicker blinks.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK let me know if that changes after 90 seconds

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Customer reply replied 2 years ago
Gee wiz. Got the heater to come on. While I was typing this up, I could smell the heater and went to check and it is now on
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK that implies the issue is with the thermostat rather than the furnace. Has thermostat been replaced since heater last worked?

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Customer reply replied 2 years ago
No. Interesting though... The thermostat went out last year and had the people that manufactured it (XCI Controls) help troubleshoot it and found it was faulty. The new one I installed is a LUX
Customer reply replied 2 years ago
I assume the jumper makes the heater come on regardless once the door button is depressed. Correct? I am going to let the button out cause it is getting mighty hot
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Jumping R and W bypassed the thermostat. Thermostat is not signaling furnace to come on.Do you know if you have a heat pump outdoor unit?If unsure give me model on outdoor and I can tell you.

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Customer reply replied 2 years ago
the XCI Smartzone-4 board in incorrect? When I turn the temp up to call for heat, I can see the green light (which indicates it is calling for heat) and red light (indicates it is calling for the blower) come on. I believe the wires from the thermostat go to the smartzone board first then to the heater. Correct?
Customer reply replied 2 years ago
It is not a heat pump.. I think. Carrier model 38TXA036330 serial 2703E28850
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Ok tell me what thermostat wires connect where on furnace board.Then lets move to thermostat. Remove front of thermostat and give me model on the thermostat, then tell me what wires are connected where.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

A picture would save a lot of typing if you can take a pic.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Send me one also of thermostat with front removed.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Next tell me model on thermostt

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Next tell me model on thermost

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Customer reply replied 2 years ago
Make is LUX. guessing model is TX9600TSa
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Lets look at the dip switches as shown on page 18/19 here

http://luxproducts.com/IMG/pdf/tx9600tsa_manual_en.pdf

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

1 should be to right

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Customer reply replied 2 years ago
all of the switches are to the right. Same as the manual shows
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Ok lets do this. Remove the Red and white wire at thermostat and touch them together or loosen screws and move white over to the Rh slot with red and see if furnace will come on.

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Customer reply replied 2 years ago
Is the jumper wire still to be in place or remove it?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Remove the one at furnace. What we are doing is basically same thing but at thermost

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Customer reply replied 2 years ago
I have the white connected to the Rh. The smartzone board shows the green light and red light on, but only the blower is on. No heater.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

On smatzone board lets check between C and W and see if we have 24v?

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Customer reply replied 2 years ago
I reset the HW button and put the wires back where they are supposed to go and put everything back in order. We are still in the same boat. The thermostat calls up the heat and blower. The blower comes on but no heat.
After I typed the above, I was attempting to check the C and W wires on the smartboard. While I was trying to do that the W2 O/B yellow led light came on. A couple of minutes later the blower turned off, the inducer vent motor turned on, the ignition light came on, but did not light nor did I hear gas being expelled. After approx 10 seconds, both the vent motor and ignition light turned off and the fan came back on and continues to run.
I am still attempting to check for 24 volts. The slots are tiny and there are no exposed portions of the wires. I can disconnect it at the furnace end and check there. Is that acceptable?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Ok it seems like we may have a couple of things going on. First of all. let me say the blower on for 90 seconds is normal when turning power on to furnace.But then when the inducer comes on and igniter does not light we should get an error code on the board telling us what failed in the circuit by giving us a flash code such as three long and one short flash or something.

To be honest with you I am not real familiar with the smartzone board and how it operates. Rather than mislead you I feel it fair to you that I opt out and see if maybe another expert familiar with the board pick up here.

Be sure if another expert picks up the question to explain that you have this smartzone board and make sure they are familiar with the board and how it works in conjunction with your furnace.

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Customer reply replied 2 years ago
Ok. Thanks thus far. Glad we got the furnace to ignite.
While I was up there trying to get a voltage reading (it has happened twice now) the process of attempting to light has repeated itself with no flame. I will continue watching to see if an error code comes up.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I will keep monitoring the question to see if anyone picks it up or if you reply with a code.

PLease wait to see if we can help before rating answer.

Leaving a poor service rating will not automatically refund your money,but reflects poorly on your expert. You have to request a refund if not satisfied with the information provided being accurate.

If no expert can help and you are unsatisfied, we can request a refund of your deposit

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Customer reply replied 2 years ago
No worries. You guys have done great. Well worth the money.
So if I change out the thermostat, it should potentially run correctly? If so, I sure don't mind getting one and going that route.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Possibly but I am still concerned why you are not getting an error code when ignition fails

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Customer reply replied 2 years ago
It has not tried to reignite again. I will try through the evening and see if it will do it again. Seems when I was messing with the wiring is when it would cycle but I never looked at the furnace LED sensor. Next time it happens, I'll be watching it.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Sounds good.

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Customer reply replied 2 years ago
I spoke with the people that make the XCI board and told them everything we have done to date. They said that if you are not getting 24V at the furnace (since the thermostat goes to the XCI board, then goes to the furnace), then the SmartZone board is out and needs replaced. Make sense to you? I am going to wire the thermostat wires directly to the furnace and see if the furnace works that way. If it does, problem solved. It will be a few hours before I get to do that but will send you the outcome. Thx
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Makes sense .Please let me know.

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Customer reply replied 2 years ago
Ok. I have wired the thermostat to the furnace and it works as it should. Conclusive evidence that the XCI SmartZone board is the problem. The XCI guys said specifically the W is what is out after talking to them again. The board is approximately $150 and can pick it up tomorrow locally.
I would have pulled my hair out trying to figure this out by myself and probably spent way more just troubleshooting this without your help. Thanks again.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I am not real familiar with that board but knew we weren't getting signal all the way to furnace.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.

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airheatman
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