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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Viessmann model wb1b-35 has error code FC, was low on water

Customer Question

Viessmann model wb1b-35 has error code FC , was low on water pressure on arrival. Added water to 15 psi control will not reset
JA: How old is the appliance? Have you gotten error messages before?
Customer: 3 yrs never had this problem
JA: Do you plan on doing the work yourself?
Customer: I'm an HVAC tech
JA: Anything else we should know to help you best?
Customer: No
Submitted: 8 months ago.
Category: HVAC
Expert:  Rick replied 8 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

An FC error is a blocked exhaust/ inoperable fan not low water pressure.