[GIORGIOF]

Hi
This past winter I installed a NOMA THM 501 thermostat. During this past winter season the HEAT worked perfect now that I switched it to COOL the air conditioning does not come on.
If the wires were not connected properly I wuold think that the heat would not work, therefore considering that the heat works the cooling should work as well
Can anyone give me a hand in fixing my dilemma?

Thank you
Giorgio

[hvac1000]

Hi
This past winter i installed a NOMA THM 501 thermostat. Durring this past winter season the HEAT worked perfect now that i switched it to COOL the air conditioning does not come on.
If the wires were not connected properly i wuold think that the heat would not work, therefore considering that the heat works the cooling should work as well
Can anyone give me a hand in fixing my dilemma?

Thank you
Giorgio

Just because the heat worked has nothing to do with the A/C signal wires at the thermostat being wired correctly. I would revisit the T-stat install FIRST. Check over the wiring and make sure the wiring is absolutely correct. I would also make sure the circuit breaker for the A/C unit is turned on in the home and the fuses/breakers(if so equipped) in the outside disconnect are turned on or in case of fuses tested to be sure they are good.

[GIORGIOF]

Thank you for the instantenous reply. I have checked the breaker at the electricla panel in the basement to ensure it is on as well I checked the switch mounted on the exterior wall outside beside the air conditioning unit. They are both turned

[wmproop]

Have you got your installation instructions for the tstat? Did it or has it got a jumper from rh to rc? Most units need this jumper