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Billy
Billy, HVAC Technician
Category: HVAC
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Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Bryant evolution thermostat blank screen .power to wiring but

Customer Question

Bryant evolution thermostat blank screen .power to wiring but unit still blank.
Submitted: 7 months ago.
Category: HVAC
Expert:  Billy replied 7 months ago.
Hello,

At what locations did you verify power to thermostat and what was reading?

Billy

Customer: replied 7 months ago.


used voltage detector. verified all units had power going to them.thermostat wires show live but thermostat does not power on

Expert:  Billy replied 7 months ago.

We may have voltage there but not to common to complete the circuit.

Are you using just a detector?
Does it pick up voltage as low as 24v ac?
Or is it a meter showing values?

Is the unit (air handler) in an attic?

Billy

Customer: replied 7 months ago.


has power A though D using low voltage light up tester. S1-S2 show nothing for room sensors

Expert:  Billy replied 7 months ago.

There are only 2 ways to have this control blank.

1 - the unit has no power or incorrect power.

2 - the unit has correct power but the control is defective.

IF....you are certain the control has proper power...the air handler has power..then the control is defective.

This runs entirely on power supplied by the air handler.

There resoans for no power like tripped water safety switches in air hander drain, no power to air handler etc....but if you indeed have power to stat...then the stat is bad.

Billy

Billy, HVAC Technician
Category: HVAC
Satisfied Customers: 19632
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Billy and 5 other HVAC Specialists are ready to help you
Customer: replied 7 months ago.

Was the thermostat ha replaced thanks

Expert:  Billy replied 7 months ago.
Thank you for the update.

Have a great weekend

Billy

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