Error code

Mitsubishi Electric CMB code 2135

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Meaning

Freezing of the water heat exchanger.: 1. If the water heat exchanger freeze prevention thermostat op3±1°C) erates (OFF at (the first time) the heat source unit stops temporarily enters the 3-minute restart prevention mode, the restarts after 3 minutes. 2. If the water heat exchanger freeze prevention thermostat op3±1°C) erates (OFF at again (the second time) within 30 minutes after the heat source units stops according to 1. above, an abnormal stop is performed and at that time, “2135” is displayed. 3. If the water heat exchanger fr

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Possible causes

(1) Failure of the heat source water circulating pump to operate. (2) Heating equipment out of order (3) Clogged or dirty water heat exchanger (4) Lead wire to the water heat exchanger freeze prevention thermostat is disconnected. (5) Connector to the water heat exchanger freeze prevention thermostat is pulled out. (6) Faulty water heat exchanger freeze prevention thermostat input circuit on the relay board. (7) Faulty water heat exchanger freeze prevention thermostat input circuit on the control board.

Solution

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