How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Phil Your Own Question
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

Why am I getting a "diag, defrost control input fail" on a

Customer Question

why am I getting a "diag, defrost control input fail" on a cooling only 35 ton voyager
Submitted: 1 year ago.
Category: HVAC
Expert:  Phil replied 1 year ago.


It is apparently a bogus error code, however if the unit is not running something else is wrong, if you can send me a clear, well focused, well lit photo of the units wiring diagram I might be able to help you diagnose it. So far I suspect its a tripped high or low pressure switch, or possibly a temperature sensor clipped to the cooling coil that is the problem.

Use the paper clip icon at the right end of the tool bar above to send the photo.



Related HVAC Questions