Cause

If dryer is not completely cool, HS error may display when “installation check” or “Flow Sense” test (duct work flow test) is run.

Both Installation check and/or Flow Sense test must be run when unit is cold or results will not be accurate.

Flow Sense Test is looking for a temperature rise or lack of a temperature rise. The unit being operated prior to test and still warm defeats Flow Sense Test.

Solution

Measure resistance red wire to black wire sensor should read 550~600Ω