Massey Ferguson 10.01.22 – Air Conditioning Module (AIRCON): Optional Cab Heater Pump Relay Signal From AC Module (AIRCON)

The control module is detecting a malfunction, open circuit, or short circuit in the signal circuit that commands the relay for the optional cab heater pump (sometimes referred to as the heater accelerator pump).

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4700
• 5700
• 6700
• 4707
• 4708
• 4709
• 4710
• 5700SL
• 6700S
• 7700S
• 7600
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7700
• 8600
• 8670
• 8690

1. 1

   Check the heater pump relay (X452 or X660) for proper switching and ensure the contacts are not burnt or corroded.

2. 2

   Inspect the wiring harness between the AIRCON module and the heater pump relay for chafed wires, loose pins, or corrosion.

3. 3

   Test the cab heater accelerator pump (X453) by applying direct 12V power to see if the motor engages, checking for a seized or shorted condition.

4. 4

   Check the cab heater water solenoid to ensure it is functioning and not shorting out the shared climate control circuits.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery's negative terminal to prevent electrical shorts during repair.

2. 2

   Access the Relay Panel

   Locate the cab fuse and relay box (often located in the cab roof harness or right-hand console depending on the exact model).

3. 3

   Replace the Relay

   If the heater pump relay (X452/X660) failed bench testing, replace it with a new 12V relay.

4. 4

   Repair Wiring

   If the harness is damaged between the AIRCON module and the relay, splice and solder the broken wires, sealing them with heat-shrink tubing.

5. 5

   Replace the Heater Pump

   If the pump (X453) is seized, drain the coolant from the heater circuit, disconnect the inlet/outlet hoses, unplug the electrical connector, and swap in the replacement pump. Refill and bleed the coolant system.

6. 6

   Reassemble and Clear Codes

   Reconnect the battery, turn the ignition on, and use a diagnostic tool to clear the 10.01.22 fault code. Test the cab heater to ensure the pump runs and the code does not return.