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VIII.

Troubleshooting

Circulation Pump

Checking PTC Pump Motor Starter (2)

Apexx

model

shown

TECH TIPS: Resistance

measurements:

 Between terminals 1 - 2 is ~

7 Ω (one of the main run

windings).

 Won’t help between

terminals 2 - 4 (start

winding, a run winding & the

motor starter). The motor

starter can’t be measured

since the windings are

always connected. Must

disconnect PTC 1st to

measure its continuity.

PTC

NOTE: Apexx (SH_99)

models shown. Wire

colors will change for

other models.

Terminal located

on motor starter

Terminal located on motor

NOTE: Unlike standard two-winding pump

motors, these three-winding pump motors

have four terminals instead of three.

NOTE: Motor terminals 2 -

3 and one of the PTC

terminals are tied together.

Bosch SHX46B05 User Manual

Questions and Answers: