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No heat after installing Lux T1500E to replace Honeywell T874G/Q674F 4wires

No heat after installing Lux T1500E to replace Honeywell T874G/Q674F 4wires


  #1  
Old 12-15-13, 01:07 AM
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Question No heat after installing Lux T1500E to replace Honeywell T874G/Q674F 4wires

I replaced two mechanical t-stat (Honeywell T874G) with a digital Lux T1500E in August and A/C worked great. Tried to turned on the heat last week and realized the heat wasn't working. I checked the wires, but they all seemed to be hooked up accordingly. What could be wrong?

Old t-stat had 4wires.
Unit 1: Red, green, yellow, and O
Unit 2: Red, green, yellow, and B

I reconfirmed wiring up new t-stat correctly, O in O and B in B on both t-stat. How come the heater didn't come on?
Although old t-stat was for multistage heat pump, it only had 4 wires. I believe my system was a single stage. If so, Lux T1500E should work, isn't it? Please help. What can I do to regain heat?

Thanks for helping!
 
  #2  
Old 12-15-13, 01:52 AM
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http://www.luxproducts.com/support/T...ENG_Manual.pdf

Place a jumper wire between Y and W.
You should also have a jumper between Rh and Rc.

 
  #3  
Old 12-16-13, 04:56 PM
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It worked! (No heat after installing LUX TX1500E)

Hi Houston204,
Thank you very much for your help. The heat came on as expected!
My bad, I should have read the manual thoroughly.
yes, you were right, it was LUX TX1500E, wasn't T1500E.

Thanks once again!
 
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Old 12-16-13, 05:07 PM
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You are welcome.
Happy to be of service.


Carlos
 
 

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