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Article reference KA-02003
Error ESS means that the heater is sensing that the room temperature probe is "short circuit".
This will require a service engineer visit to check the room temperature probe & controller.
Please use the link below for further assistance:
Applicable to models: TRM21W4, TRM14W5, TRM21W5, TRM28W5, TRM21C4, TRM14C5, TRM21C5, TRM28C5, CTR7W, CTR7C, CTR10W, CTR10C, CTR12W, CTR12C
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