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6. Troubleshooting Troubleshooting must be performed only by personnel certified by Mitsubishi Electric. [1] Diagnosing Problems for which No Error Codes Are Available If a problem occurs, please check the following. If a protection device has tripped and brought the unit to stop, resolve the cause of the error before resuming operation. Resuming operation without removing the causes of an error may damage the unit and its components. Problem Check item Cause Solution The unit does not operate. The fuse in the control box is not blown. The power lamp on the circuit board is not lit. The main power is not turned on. Switch on the power. The power lamp on the circuit board is lit. The pump interlock circuit is not connected. Connect the pump interlock circuit wiring to the system. The flow switch wiring is not connected. Connect the flow switch wiring to the system. The fuse in the control box is blown. Measure the circuit resistance and the earth resistance. Short-circuited circuit or ground fault Resolve the cause, and replace the fuse. Automatic Start/Stop thermistor has tripped. Water temperature is high. Normal Water temperature is low. The setting for the automatic Start/Stop thermistor is too low. Change the setting for the automatic Start/Stop thermistor. The unit is in operation, but the water does not heat up. Water temperature is low. The water inlet/outlet temperature differential is normal. The water-heating load is too high. Install more units. Low refrigerant charge due to a leak. Perform a leakage test, repair the leaks, evacuate the system, and charge the refrigerant circuit with refrigerant. The water inlet/outlet temperature differential is small. LEV fault in the main circuit Replace the LEV in the main circuit. Compressor failure Replace the compressor. High pressure is too high, or low pressure is too low. Operate the units within the specified pressure range. Water temperature is high. Water flow shortage Increase the water flow rate. Problem with the external devices Repair the devices. 60PDF Image | QAHV-N560YA-HPB
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