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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8067
Experience:  Furnace, A/C and heat pump specialist.
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Blinks 3 rapid then 3 slow

Customer Question

Blinks 3 rapid then 3 slow
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

33 is an open limit code. Do you know what limits are and do you have a multi meter to troubleshoot?

Customer: replied 1 year ago.
Will get multimeter bk in 15
Expert:  airheatman replied 1 year ago.

Below are most likely causes .Lets start with checking the reseteable ones. Look above burners and on draft hood. They will have a button similar to one shown below that pushes in to reset.

Expert:  airheatman replied 1 year ago.
Expert:  airheatman replied 1 year ago.

Approaching 11PM here .Will be leaving office soon.First check the resetables. If all are closed , trace the limit circuit to locate each limit and check it for continuity until you find which one is open.

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