IV–13A10 Exhaust Gas Temperature Highc Error detection methodDuring engine operation (complete combustion), when the exhaust gas temperature ≥ 130°C continuously for 10seconds, the engine is stopped momentarily and an error flag is set.An Exhaust Gas Temp. High error is assumed when this flag has shut down the engine once.d Troubleshooting1Exhaust gastemperature1-1 Measure the actual exhaust gas temperature. Is it high?Yes 2-1No 4-12Coolantamountcheck2-1Is there any sign of the coolant leaking?• Check the base and around the base.• Check the amount in the reserve tank.• Check the coolant route (detached hose, etc.)OK 2-2NGRepair the leaks andthen refill with coolantand perform an airpurge.2-2Is the coolant pump operating normally?• Carry out an inspection while referring to A22.• Are there any fluctuations in coolant pump revolutionsor repeated starts/stops, etc., when the coolant pump isoperating?OK 3-1NGThere is a possibilitythat air has becomemixed in, so refill withcoolant and perform anair purge.3Exhaustgas heatexchangercheck3-1 Is there heavy soiling on the inside of the exhaust gas tube onthe exhaust gas heat exchanger?Yes Replace the exhaust gasheat exchangerNo 4-14Wiring andthermistorcheck4-1Measure the resistance on the exhaust gas temperaturesensor (see “5. Reference Document” for details on thermistorcharacteristics.)OK Outdoor unit’s powerboardNG Replace the sensor● For board and Electrical Wiring Diagram, see Chapter 6.• Outdoor main board: page VI-2• Outdoor power board: page VI-3• Converter board: VI-4• Indoor control board for DC motor models: page VI-5• Outdoor Unit Electrical Wiring Diagram: page VI-6
