Sinclair SDV 6 Service Manual page 75

8.1.13 b34, b35 - Stall protection for 1# water pump, stall protection on 2# water pump
Error display
Error impact
Error trigger
Error recovery
Possible cause
Troubleshooting
72
Digital display
The faulty IDU stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
The main control board of the IDU detects the pump rotation speed ≤ 100 rpm for 10 seconds
Automatic recovery
 The water pump suction impeller is clogged.
 The water pump plug to the PUMP port in the IDU main control board is loose.
 The pump body is damaged (due to motor damage, control drive circuit damage, etc.).
 The IDU main control board is damaged.
b34/b35 (1)
Note:
1. The error code corresponds to the following two situations:
1) If there is only one PUMP port on the main control board of the IDU, when a stall error occurs in
the water pump connected to the PUMP port, the error code is b34.
2) If there are two PUMP ports on the main control board of the IDU named PUMP1 and PUMP2,
when a stall error occurs in the water pump connected to PUMP1 port, the error code is b34; when
a stall error occurs in the water pump connected to PUMP2 port, the error code is b35.
2. Figure 1 above shows the pins of the PUMP port. The output voltage between pin 2 and pin 3
can be measured with a multimeter in DC voltage gear. If the output voltage is less than 11 V, the
water pump cannot be driven.
Panel, display box, and wired controller
Cause 1: Water pump
suction impeller is clogged
Cause 2: The water pump
plug to the PUMP port in the
IDU main control board is
loose
Cause 3: DC voltage output
between Pin 2 and Pin 3 of
the PUMP port in the main
control board is less than
11V (2)
Cause 4: If the error cannot
be cleared after causes 1/2/3
have been eliminated, it can
be determined that the pump
body is damaged
Display position
Remove the debris at
the suction, and clean
the drainage pan and
drain pipe
Reconnect the loose
plug
Replace the main
control board of the
IDU
Replace the water
pump