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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22514
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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My controller ducted system isnt showing any thing on the

Customer Question

my controller for 9kw ducted system isnt showing any thing on the display, there is 28v supply at the control unit
when it is unplugged and re plugged in , all characters on display are lit up for 1sec and then it turns off
any ideas?
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.

I am very sorry your question has not been picked up yet.

I just logged on and found you had not been assisted.

Please let me know if you still need help and I will do my best. Please do not "Rate" as we have not worked toward an answer yet.

If you would like to proceed let me know by replying.

Customer: replied 1 year ago.
Can you please have a look aT this
Expert:  BillyHvac replied 1 year ago.

does the thermostat also have a c terminal?

Customer: replied 1 year ago.
Expert:  BillyHvac replied 1 year ago.

use meter on thermostat terminal R and C and tell me voltage

Customer: replied 1 year ago.
Expert:  BillyHvac replied 1 year ago.

last test.

If you take the red wire from r in thermostat

and twist together with the white (W) terminal wire...does heat come on?