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Tempstar — PDS4 packaged gas/electric unit
Code 1 Flash · Packaged rooftop gas/electric unit · easy
“A barber shop's rooftop unit keeps 'half-heating': warm air for a few minutes, then cool air while the fan keeps blowing. The IGC board's LED is flashing once, over and over.”
Based on
Tempstar error-code database — 1 Flash (limit switch fault)Tempstar PDD4/PDS4 series installation & operation manual