Circulation Pump - Checking Ptc Pump Motor Starter - Bosch SHI4302 Manual

VIII. Troubleshooting
VIII. Troubleshooting
Circulation Pump
Circulation Pump
The (PTC) circulation pump motor starter (# 182318) is used on SHX99B
/ SHV99A / SHY99A ("Apexx"), & SHX56B / SHV66A / SHY56A-66C
("ExactWash") models with water switches.
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.
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.
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).
- Checking PTC Pump Motor Starter (1)
- Checking PTC Pump Motor Starter (1)
3 2 4
1
The two main windings (with the start/run capacitor) have
The matching circulation
HINT:
starter) is located on top
of the pump motor and
can
directions -- facing out or
facing over the motor.
To install (PTC) motor starters,
push female terminals over pump
motor terminals 2 & 4.
terminals are different sizes to
match the smaller motor terminal 4.
71
PTC (motor
face one of two
The