Error code: 1907

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An abnormally low temperature of the AFTER HEATER(64) on the HEATER RELAY BOARD ASSY.
An abnormally low temperature of the AFTER HEATER(64) is detected.
Check whether the AFTER HEATER(s)(64) is properly connected. Check whether the THERMISTOR, AFTER(s) is correctly installed. Check whether the THERMISTOR, AFTER(s) is properly connected. Check whether the FUSE has blown. If so, replace the FUSE. Replace the HEATER RELAY BOARD ASSY.