Blower Prover Open; Blocked Air Intake - State Water Heaters she50 Instruction Manual

She50 100 series commercial gas water heaters

Table of Contents

fault and alert MessaGes (cont)

Call the technical support phone number listed on the back cover for further technical assistance or to locate a qualified service agent in

your area.

possIble causes - checK/repaIr

• The control system has detected the Blower Prover Switch

contacts are closed when they should be open at the beginning of

a heating cycle.

• Pinched/shorted Blower Prover Switch wiring.

• Jumper wire connected to the Blower Prover Switch - remove

jumper wire. Jumper wires must never be used, read all Warnings.

• Excessive wind outdoors pressurizing the vent system piping.

• Excessive negative air pressure in the installed space.

• The control system has detected the Blower Prover Switch

contacts are remaining open after the control system has

energized the Combustion Blower.

• Loose or open wiring to the Blower Prover Switch.

• Blower Prover Switch air sensing tube disconnected, kinked, filed

with condensate, damaged or leaking - repair or replace tube.

• Combustion Blower is not running when energized.

• Loose or open wiring to Combustion Blower.

• The control system has detected the Blocked Intake Air Switch

contacts are open.

• Loose or open wiring to the Blocked Intake Air Switch.

• Excessive equivalent pipe length, exceeded the maximum number

of 90° elbows or wrong pipe size used in the intake air piping

system.

• Excessive negative air pressure in the installed space.

• The control system has detected the ECO (energy cut out) Switch

contacts are open.

• The ECO switch is a normally closed switch that opens on a

temperature rise to prevent excessive water temperature in the

storage tank. The ECO switch is inside the Temperature Probe

(two red wires).

• Loose or open wiring to the ECO switch in the Temperature Probe

- two red wires.

dIsplaYed fault/alert MessaGe

Blower Prover Failure

The blower prover switch is

closed out of sequence.

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