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VIII.

Troubleshooting

Circulation Pump

Checking PTC Pump Motor Starter (1)

The (PTC) circulation pump motor starter (# 182318) is used on SHX99B

/ SHV99A / SHY99A (“Apexx”), & SHX56B / SHV66A / SHY56A-66C

(“ExactWash”) models with water switches. The matching circulation

pump (# 239129) has three slightly smaller & more efficient windings

compared to the traditional pump with two larger windings (# 266511

motor / # 239144 pump). The 3rd (start) winding is cut out when the

motor gets running. This stronger pump is needed due to the increased

water flow resistance from the water switch.

HINT: PTC (motor

starter) is located on top

of the pump motor and

can face one of two

directions -- facing out or

facing over the motor.

To install (PTC) motor starters,

push female terminals over pump

motor terminals 2 & 4. The

terminals are different sizes to

match the smaller motor terminal 4.

The (PTC) motor starter helps start the circulation pump. It’s a ceramic thermal

switch which conducts current & heats up, cutting out the 3rd (start) winding at a

preset temperature. The two main windings (with the start/run capacitor) have

power whenever the pump is running.

 Check the motor starter if the pump motor won’t start (starter stuck open) or

runs hot (starter stuck closed).

Bosch SHX46A05 User Manual

Questions and Answers: