Bosch IDS 2.0 Service Manual page 78

7 8 | Bosch IDS 2.0
Component Check
High voltage power supply to board
Thermostat connection
LED light
Electric heat
Low voltage power supply to board
Indoor blower motor
Table 52 Indoor Board Component Check
1) Depends on SW6-1&2 dipswitch fan speed settings. High or low speed depends
on if Y1 (low) or Y2 (high) call. Measure between speed pin and C (brown wire).
Data subject to change
Measure location
Terminal Block
(L1-L)
CN5
(Y1-C, Y2-C, R-C, G-C)
CN4
(Dh-C, B-C, W1-C, W2-C)
LED 4
CN6
(W1-C, W2-C)
CN33
CN39-COM
CN35 (1,2,3,4,5-C) ¹
Parameter When to check
172-270V(AC) When there is high voltage power to unit
18-30V(AC) When there is call from thermostat
Light or fl ash When there is high voltage power to unit
172-270V(AC) When there is a call for electric heat
18V-30V(AC) When there is high voltage power to unit
230V(AC) When there is high voltage power to unit
18-30V(AC) When the compressor is running
Service Manual
07.2021 | Bosch Thermotechnology Corp.