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Old 04-28-2012, 01:27 PM   #1
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hrv problem


My lennox 150 sdp seems to have the defrost damper stuck in the defrost position (up) and, consequently, no fresh air is getting into my house and the fan seems to be stuck in high speed. Any ideas what the problem might be?

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Old 04-28-2012, 06:56 PM   #2
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hrv problem


try powering it down and back on.... I cant find the service manual for that model.... it would help....

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