Service Manual for Bosch IDS Heat Pump 115V Modular Blower

Quick Guide and Safety

This service manual is intended for qualified service agents. Before performing any maintenance, ensure the power is disconnected. Always discharge your body's static electricity before touching the integrated control module to prevent damage. When handling sheet metal parts, wear appropriate protective clothing, safety glasses, and gloves to avoid injury from sharp edges.

Troubleshooting

The unit uses diagnostic LED blinks to indicate specific operational problems. Refer to the troubleshooting chart to identify the issue based on the LED status:

• b3 (3 blinks): Refrigerant sensor fault. Replace the refrigerant gas sensor.
• b4 (4 blinks): Communication fault between refrigerant sensor and main control chip. Contact installation service provider.
• b5 (5 blinks): Communication fault between furnace and ODU. Check wiring and driver board.
• b7 (Rapid Flashing): Refrigerant leakage protection. Turn off the compressor, maintain ventilation, and avoid open flames.
• b8 (8 blinks): Refrigerant sensor out of service life. Replace the sensor.
• b9 (9 blinks): Dip switch SW7-2 does not match refrigerant sensor. Check switch settings.

Control Module Settings

The control module features DIP switches for configuring fan speed and communication modes. Ensure settings are correct for your specific installation:

• SW6-1, SW6-2: Configure fan speed taps.
• SW6-3: Anti-cool air settings.
• SW7-1: Communication mode (Non-communication vs. Communication).
• SW7-2: Refrigerant sensor configuration (With vs. Without sensor).
• SW7-3, SW7-4: Machine type selection (A, B, C, or D).

Wiring Diagram

The wiring diagram provides a reference for electrical connections, including the terminal block, transformer, fan motor, and control board. Ensure all wiring is properly polarized and grounded according to N.E.C. and local codes. Use copper conductors only, and if replacing wires, ensure they have a temperature rating of at least 105 degrees Celsius.

Fan Motor Check

If the fan does not start normally, perform the following voltage checks:

• Between L and N (CN14, CN13): Voltage should be between 98V and 127V.
• Between C and 1, 2, 3, 4, 5 (CN35): Voltage should be between 18V and 27V.

If the motor winding voltage is normal but the fan does not start, check the PCBA for visible damage or resistance between windings. If the issue persists, replace the motor.