Bosch IDS Ultra Series Technical Service Bulletin

Technical Service Bulletin:
Control Board Replacement Procedure
Models: Bosch IDS Ultra Heat Pumps
WARNING
Dangerous operation, injury or property damage!
Improper servicing could result in dangerous operation, injury or property damage. The
operations described below must be performed by qualified personnel.
NOTICE
Product damage!
Do not directly touch the components on the main board to avoid static electricity
damage.
NOTICE
Product damage!
The factory default mode is communicating mode and Dip Switch SW5-4 is set to OFF
position.
If replacing a unit configured to conventional 20VAC non- communicating mode, ensure
Dip Switch SW5-4 is set to ON position. See Table 1.
Check the control board is set to the correct tonnage by setting Dip Switch J2. See
Table 2.
SW5-4 Dip Switch Settings
Communicating
Non- Communicating
Table 1
J2 Dip Switch Settings
4 Ton
5 Ton
Table 2
Data subject to change without notice | Printed in the USA | BTC 762002303 A | 08.2024
ON
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
ON
ON
OFF
Board Replacement Procedure (BOVA-60MTB-M19E)
1. Turn off power to both the indoor and outdoor unit and wait AT LEAST 5 minutes
before removing the outdoor unit's control board access panel.
WARNING
Electrical hazard 380 volts DC!
Wait 5 minutes after disconnecting power, then verify DC voltage is less than 43 VDC at
inverter test points P-N of socket CN22. Components may store a dangerous electrical
potential of 380 Volts DC. Failure to follow these instructions could result in personal
injury or death.
NOTICE
Improper operation!
Take a picture before removing any screws or wiring to use as reference when installing
the new board.
Use a screw driver instead of an electric screw driver/drill or damage to the control
board may occur.
Hold the board before removing the last screw, otherwise the main board may fall and
cause damage.
There is no need to disconnect the field supplied wires; directly remove the wire
plugs on the control board.
2. Remove wires and plugs from control board.
3. Remove the 5 compressor wire plugs, power wire screws and ground wirescrews
(refer to Figure 1: items circled in blue).
NOTICE
Product Damage!
There are 5 different types of screws; they should not be mixed. Different screw types
are installed in different locations. Refer to color coding in Figure 1 for appropriate
screw type and location.
Bosch Thermotechnology Corp.