Blower Prover Open; Blocked Air Intake - State Water Heaters SUF-100-250 Instruction Manual

Commercial gas water heaters

Installation, user and service manual (118 pages)

Instruction manual (80 pages)

Service handbook (54 pages)

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 - see the Sequence Of Operation on page 58.

• Pinched/shorted Blower Prover Switch wiring - see beginning on

page 8 for switch location.

• Jumper wire connected to the Blower Prover Switch - remove

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

on page 61.

• 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 - see the Sequence Of

operation on page 58.

• Loose or open wiring to the Blower Prover Switch - see beginning

on page 8 for switch location.

• 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 or plug connections 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 - see

beginning on page 8 for switch location.

• Excessive equivalent pipe length, exceeded the maximum number

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

system - see Venting Requirements on page 24.

• intake air screen was not removed prior to connecting the intake

air piping to the water heater and is clogged/blocked with debris -

see Figure 19 on page 26.

• SUF 199 & 250 models only; condensate has drained into the

Blocked intake Air switch through the sensing tube, see SUF 199 &

SUF 250 intake Air Connection on page 23.

• 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 Upper Temperature

Probe (two red wires) - see beginning on page 8 for Upper Probe

location.

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

Probe - two red wires.

• improper water system piping and/or excessively high return

(recirculation) loop water temperature - see the Water Piping

Diagrams beginning on page 71.

• The control system has not detected any voltage from the powered

anode rods - see beginning on page 8 for location.

• No water in the storage tank.

• Loose or open wiring connections to the powered anode rods - see

beginning on page 8 for location.

• Powered anode rod wiring shorted to ground.

• The water heater is not properly grounded - see Power Supply

Connections on page 41.

• Loose or open ground wires.

• Top fitting (3/4 inch bushing) of the powered anode rods were

saturated with water during installation - with power to the water

heater turned off, carefully remove anode rods and dry out

bushing(s).

displayed fault/alert message

Blower Prover Failure

The blower prover switch is

closed out of sequence.

Call a service professional:

Your Company Name Here

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