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19739 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 late - P0687 ECM/PCM Power Relay Control Circuit High
Main Relay opens too early / too late - main relay shut off too late - P0687 ECM/PCM Power Relay Control Circuit High

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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