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Heating & Air Conditioning

Thermostat wiring?

2 months ago

Hello all.

So recently last month I just got a new furnace replaced. I've noticed that my heat comes on for about 5 minutes, turns off when it reaches the temperature that i've set it at. After 3 minutes the furnace turns on again. I find that very unusual so i decided to open the thermostat cover to see the inside. This is the current diagram.

Are the wiring correct?

thanks

Featured Answer

mike_home

2 months ago

It is not possible to tell if the wiring is correct without knowing how the wires are connected at the furnace control board. What is the temperature setting of the thermostat? Is there a supply vent near the thermostat which could be affecting the nearby air temperature? The furnace might be too large, but that would not explain when it is cycling on again after 3 minutes.

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Comments (6)

sktn77a
2 months ago
Sounds like your system may be oversized. What make/model is it and what did it replace?
drewc cee thanked sktn77a
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What is the model number of the thermostat? Without that information it is difficult to say of the wiring is incorrect for a heat pump. The wiring appears to be connected to the correct terminals. The only think unusual would be the two wires connected to AUX/E. Perhaps your heat pump control board has separate auxiliary and emergency heat terminals and this thermostat combines the function into one terminal.
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It appears you have wired the new thermostat correctly. How long does the blower run before the condenser kicks in? How long are you waiting between attempts of lowering the thermostat temperature in order to start the condenser? What might be happening in the new thermostat is the the G terminal is energized immediately which turns on the blower, and the Y terminal has a delay and energizes after a period of time. On most furnace control boards the Y terminal also turns on the blower. So as an experiment try disconnecting the G terminal and then lower the thermostat enough to turn on the AC. The blower and condenser should turn on at the same time. The clunking you hear is probably the condenser contractor closing. I don't see how changing the thermostat would affect the noise level.
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In a two wire thermostat which is controlling heat only, the connections are 24 V power (R) and heat (W). When the thermostat calls for heat, the W terminal is energized to 24 V. You have to trace the red and white wires to seen how they are connected in the boiler. I would think the red wire is the R connection, and the white wire is the W connection, but that is not guaranteed. The terminals in the picture make no sense since nothing is connected to W, and there is a connection to Y which is normally used for cooling. I am not sure the purpose of this connector. Do you have an AC controlled by another thermostat? Does the Honeywell thermostat you purchased have WiFi? If it goes then you need a ground connection. There should be a ground on the furnace control board. Once you find it you will have to run a wire up to the thermostat.
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drewc cee
Original Author
2 months ago
Thanks for the reply. Seems like there is nothing wrong with the furnace itself. The thermostat was acting a bit weird so the technician on the phone told me to reset the thermostat. It worked!

no more short cycling and the temperature reading is more accurate! the heat turns on itself every 15-20 minutes now!

thanks!
mike_home
2 months ago
What is the brand and model number of your thermostat?
drewc cee thanked mike_home
drewc cee
Original Author
2 months ago
hi mike

it is the

Honeywell TH2110DV1008 PRO 2000 Vertical Programmable Thermostat
mike_home
2 months ago
The Honeywell TH2110DV1008 is a very basic thermostat. Was this installed as part of the new furnace installation? You said you reset the thermostat. I am curious how you did the reset. Also does it have a fresh set of batteries? I am wondering if there was a power glitch and the thermostat came up in an weird state requiring a reset.

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