Description:

The error code ETC 001549.07 is triggered when the control unit receives a valid position signal from the heater valve potentiometer (B131), but the heater valve cannot be moved to its desired position via the motor’s connecting leads. This indicates a mechanical fault at the heater valve or an open line at the motor’s connecting leads.

Reaction:

When this fault is detected, the control unit may disable or limit the operation of the heater valve to prevent further issues. This can result in the heater valve not moving to the desired position, affecting the heating system’s performance.

Recommendations:

Inspect Mechanical Components:

• Check Heater Valve Movement: Verify that the heater valve is not obstructed and can move freely. Check for mechanical faults such as blockages or damage.
• Inspect Motor Operation: Ensure the motor connected to the heater valve is functioning correctly and can move the valve as required.

Inspect Electrical Circuits:

• Check for Open Circuits: Inspect the wiring and connectors for open circuits at the motor’s connecting leads (2016 and 2027). Look for broken wires or loose connections.
• Measure Voltage and Signal: Use a multimeter to measure the voltage and signal at the motor’s connecting leads to ensure proper operation.

Test and Replace Components:

• Test Heater Valve Potentiometer: Verify the operation of the heater valve potentiometer. Replace the potentiometer if it is found to be malfunctioning.
• Inspect Control Unit: Ensure that the control unit is functioning correctly. Replace the control unit if it is found to be faulty.

Repair or Replace Wiring:

• Fix Open Circuits: Repair or replace any open or faulty wiring in the heater valve circuit. Ensure all connections are secure and properly insulated.

Note:

Regular maintenance and inspection of both the mechanical and electrical components of the heater valve can help prevent faults. Ensuring proper operation and connectivity will enhance system reliability and performance.