08:50AM | 12/16/05
Member Since: 12/15/05
3 lifetime posts
I have a Bryant 397HAW036080 ACBA furnace that Short cycles.

When heat is called for the first time the main valve only stays open for a few seconds.

Inducer and blower continue to run.

The cycling continues with the MGV staying open for longer periods each cycle up to about 90 seconds when the house is heated enough to satisfy the thermostat.

It appears something is temperature sensitive either in the control board (fairly simple - 1985 vintage) or the gas valve itself is temperature sensitive.


09:26AM | 12/16/05
Member Since: 12/15/05
3 lifetime posts
There is no main flame sensing on the schematic, only a pilot flame sensor.


12:12PM | 12/16/05
Member Since: 12/15/05
3 lifetime posts
You were correct. A new sensor solved the problem. Took a little adjustment in spark probe tip position to get reliable pilot ignition. Thank you very much!


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