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PDX Series
Frozen intake or exhaust vent terminal
If an intake or exhaust vent terminal is blocked with ice or snow due to severe conditions, the pressure switch and control
will not allow the burner to operate. This will result in a three flash error code. Once the blockage is removed (through
melting or other means) the controls will let the burner operate. The position of the vent terminals in relation to each other
and terminals from other appliances can have an effect on the potential for blockage due to ice or snow. See the
installation instructions for recommended positioning of the terminals.
Testing under severe conditions has shown that the optional concentric vent terminal is resistant to ice blockage. Contact
Bradford White or the supplier of the water heater for information about ordering the optional concentric vent terminal.
Bradford White has also developed an air intake relief device that can be installed in the air intake near the water heater
temporarily enabling the water heater to operate with a frozen intake terminal. Contact Bradford White or the supplier of
the water heater for information about the air intake relief device.
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