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Tech support

Online support - Hitachi ASHPs

We have collated some of the more commonly found issues with the Hitachi ASHP. If you’re still experiencing any problems, please contact our technical support team via or give them a call on 01404 540745 (available from 8am to 5pm, Monday to Friday).

Ideal control settings:
Domestic hot water – continuous.

Heating- manual. This will ensure good hot water and only top up when required. With underfloor heating, it is better to keep the heating at a constant lower temperature for all day comfort rather than allowing the property to cool down and heat up. It will also be more energy efficient.

Controller fault codes:
If the system develops a fault, this will be shown on the main Hitachi controller. Normally it will display TEXT **°C. If a fault is detected it will display FAUL *. The number tells the engineer what the fault relates to. Every so often the controller will self check and you may see it display FAUL 0. This shows there are no faults and the system is operating properly. FAUL 9 means it has detected a problem with the heat pump. Quite often this could be air in the system or a blocked filter causing a high pressure alarm in the heat pump. Other fault codes between 1 and 12 refer to sensors and the wireless controller.

The first action if a fault code appears is to switch the mains power to the Hitachi controller off and on. This will re-set the unit. If the fault code re-appears then you should contact your installer or Nu-Heat.

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