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    allend73's Avatar
    allend73 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 18, 2012, 06:45 PM
    AC will not come on/thermostat has no readout
    Payne py3pna042090ab

    Unit has no readout on thermostat.checked 24v at unit=good.continuity on green and red wires are good from unit to thermostat.no voltage coming back from thermostat to unit. This should be a bad thermostat but wanted some confirmation.also,I pushed contactor to make unit work and the only thing that came on was the compressor.could I have multiple problems or will the thermostat cause the blower motor not to come on?
    thermalmedics's Avatar
    thermalmedics Posts: 153, Reputation: 13
    Junior Member
    		  
    #2

    Apr 18, 2012, 09:12 PM
    Do you have a common wire (not the red one) at the thermostat for power or just battery power?

    Should read 24v between the red and common at thermostat.
    Contactor = compressor and condenser fan motor only (for the most part)

    Blower on green wire

    Package or split system?
    straight cool with gas heat or heat pump?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #3

    Apr 19, 2012, 05:52 AM
    I bet you just need to change the batteries in the thermostat.
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