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Lennox LZP-4 control panel, I changes a thermostat and now

Customer Question
the control panel is not...
Lennox LZP-4 control panel, I changes a thermostat and now the control panel is not powering the new or the old thermostat, completely dark. There control panel still working in other part of the house and is controlling the second unit fine. Green displaying on control panel power, but one red led is glowing when cover is removed by the "B" terminal, any thoughts as to what might have gone wrong? Thankyou
Submitted: 1 year ago.Category: HVAC
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Answered in 10 hours by:
12/22/2015
HVAC Technician: gotoman for ac, HVAC Technician replied 1 year ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,237
Experience: 51 years of experience install design and repair of all makes and models of AC
Verified

Attach picture of the wiring at thermostat. Russ

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HVAC Technician: gotoman for ac, HVAC Technician replied 1 year ago

Do you have picture of old thermostat terminal board. Russ

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Customer reply replied 1 year ago
The pictures are of the old thermostat.
HVAC Technician: gotoman for ac, HVAC Technician replied 1 year ago

Just sounds like a blown fuse in air handler. There may be a small breaker on transformer in air handler. Turn off power before checking fuse.Open panel of air handler and check the fuse in the low voltage line. If you have a voltmeter check the voltage between R and any terminals to see if you re getting voltage. The board may be powered externally from thermostat. The fuse is in the line from transformer. The transformer is a square component that has high voltage wires on one side and low voltage on the other side. It is labeled 24 volts one side. Russ

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