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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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What is the cause or possible problem with code 90?

Customer Question

What could be wrong with code 90? I have had this problem since one day. I don't have the trouble shooting manual with me. I am a tech
I just want the cause or possible problem with code 90, to me it is a communication problem.
Submitted: 11 months ago.
Category: HVAC
Expert:  BillyHvac replied 11 months ago.
You are actually means excessive errors meaning it faulted enough times within a time period to code as a habitual offender.
Does the wire run near any fluorescent lights?

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