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31 HIGH
PRESSURE SWITCH FAULT - Indicates high pressure switch is
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closed at call,
or in low heat,
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or fails to close
after call, or opens in high heat.
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Check for: -
Plugged condensate drain.
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- Water in vent
piping, possibly sagging pipe.
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- Improper
pressure switch wiring or pressure switch tubing connections.
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Failed or
"Out-of-Calibration" pressure switches.
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32 LOW
PRESSURE SWITCH FAULT - Indicates low pressure switch is
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closed at call,
or fails to close
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after call, or
opens during operation.
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Check for: -
Plugged condensate drain.
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- Water in vent
piping, possibly sagging pipe.
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- Improper
pressure switch wiring or pressure switch tubing connections.
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- Failed or
"Out-of-Calibration" pressure switches
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