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19742 Error Code For Allis Chalmers Tractor Models

There are 2 kind of error description.

Description:

D3 Main Relay opens too early / too late - main relay shut off too early (before EEPROM update) - P0685 ECM/PCM Power Relay Control Circuit /Open
Main Relay opens too early / too late - main relay shut off too early (before EEPROM update) - P0685 ECM/PCM Power Relay Control Circuit /Open

If Heater does not work,Low coolant level. Check coolant level; add if necessary, faulty thermostat, heater control valve not functioning properly ,heater core or hoses clogged or damaged. Flush cooling system. See your John Deere dealer or replace heater core or hoses.

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