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Old 05-30-2013, 11:43 PM   #1
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Commercial hvac help, HVAC troubleshooting - no power?


Hello-

Wanted to get some opinions. We are a Mom &Pop shop and of course are responsible for our hvac. It was working yesterday and today it simply just was not working. No air no heat. Nothing blowing. Just nothing. Power is gettinh to the thermostat.
We have an Hvac guy coming out, but wanted to get an idea of what it might be. Here is what we have done so far:
Breakers checked
Water pan checked
Thermostat replaced
Safety switch checked
Fuse checked

However with the breaker we have only come across one 110v breaker.

We are in a three business strip center. The business next to us just vacated the building. Final walk through for them was today.
What do you think?

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Old 05-31-2013, 04:52 AM   #2
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Commercial hvac help, HVAC troubleshooting - no power?


Made this its own thread.

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Old 05-31-2013, 07:13 AM   #3
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Commercial hvac help, HVAC troubleshooting - no power?


do you have LED or lights on the stat?does the supply fan run in FAN/ON off the stat?...both indicating 24Vs at least..if none ...TR is either cooked or blowb fuse....what is up at the unit disconnect.just a plain knife switch or fused..? model on rooftop would help..definitely not a 115V single breaker for the system
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