The reported complaint was confirmed.The field service representative (fsr) tested the heater cooler and confirmed the heater on the ¿a¿ channel was open when measured across the blue wires.This heater failure was the source of all the alarms reported.Channel "a" failed but channel "b" operated to the manufacturer's specifications.There will be no parts to be returned, because removing the failed heater would disable the unit.The parts needed for repair are obsolete.If additional information becomes available on this complaint that would alter the facts and/or conclusion, a supplemental report will be filed accordingly.
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