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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22678
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have a comfort zone II system and I get an E1 and an E3

Customer Question

I have a comfort zone II system and I get an E1 and an E3 error code. My HVAC guy hasn't been able to do anything for this. System seems to work intermittently
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.


what is the temperature outside when e3 happens?


Customer: replied 1 year ago.
Right now it's 23 but when I try to read outside temp thru thermostat I get "--"
Customer: replied 1 year ago.
I did get a reading earlier of the outside temp but not now
Customer: replied 1 year ago.
Mostly have the E1 error code, this can happen when about 50 outside temp. The furnace does work at times but it's a crap shoot
Expert:  BillyHvac replied 1 year ago.

thank you,

it appears you have a bad outdoor sensor, or the wiring is bad. Usually it is the sensor itself. The E1 is a communication fault. This can be anything from a poor wire connection, high voltage interference (Wire run near fluorescent light ballast) or a bad board.

The highest odds are wiring connections or voltage interference.

Make sure the thermostat wire is run separate from any high volt not run in same conduit as 120v.....check connections at both ends and reseat. Make sure thermostat wire is not near fluorescent light or other high voltage source.

If issue persist have circuit board checked.

so for now replace outdoor sensor and verify wire connections.

Expert:  BillyHvac replied 1 year ago.

outdoor sensor is E3 code