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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22247
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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How do i put a lennox outside unit in test mode to reset

Customer Question

How do i put a lennox outside unit in test mode to reset
Submitted: 6 months ago.
Category: HVAC
Expert:  BillyHvac replied 6 months ago.

hello,

what is the outdoor model number?

Customer: replied 6 months ago.
Xc21-048-230-10
Expert:  BillyHvac replied 6 months ago.

This unit resets just by removing 24v signal..ie - turn off ac and back on.

Here is a service manual

Customer: replied 6 months ago.
Tried that already
Expert:  BillyHvac replied 6 months ago.

then it is not a resettable issue.

Do you have an active alert?

Customer: replied 6 months ago.
code 413
Says reset to solve
Expert:  BillyHvac replied 6 months ago.

This is a high head pressure code.

This means it depends why it tripped..

fan motor not working, coils plugged etc.. With this unit it is commonly an issue with the condensing fan motor.

Expert:  BillyHvac replied 6 months ago.

So in other words...your code will not reset while the issue still exist

Customer: replied 6 months ago.
Reproof, guys put plywood over unit to protect. Now unit won't come on
Expert:  BillyHvac replied 6 months ago.
Customer: replied 6 months ago.
No reset switch
Expert:  BillyHvac replied 6 months ago.

have you tapped that switch?

Customer: replied 6 months ago.
Expert:  BillyHvac replied 6 months ago.

Ok lets try a hard reset..

Turn off breaker to ac unit

Turn off breaker to indoor blower/furnace

1 minute later turn on ac unit, then furnace