Knowledge Base Index :   KnowItAll Board Layout

How do I know what HVAC mode is being requested or served?

The HVAC output LED's indicate clearly which mode is requested or served. From left to right at the top of board:

* 2 Red LED's indiacte first and second stage call, W1 and W2
* 2 Yellow LED's indicate first and second stage call, Y1 and Y2
* 1 Green LED indicates fan operation
* 1 Yellow LED indicates heat pump reversing valve coil

Article Details
Date Created January 24, 2008
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