Error code

Mitsubishi Electric klima code FS

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Meaning

function is For 10 mins after switched on.: freeze protection when THW1 detects 10 consecutive seconds a temp. ≤ 3ºC for 10 not be displayed if; disabled, water circulation pump1

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Possible causes

(1) Insufficient system head a or consecutive (2) Reduced flow in primary water circuit. Due to 1 or more of the following; Faulty pump, insufficient air purge, is blockedstrainer, leak in water circuit. (3) Valve operation fault (4) 2-way valve (field supply) actuator fault (5) 3-way valve actuator fault (6) THW1 has become detached from its holder. (7) THW1 or THW2 fault (8) FTC4 board failure

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