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When tracing a fault code, use the table of fault codes on page 32 to help you. As often as not, it will be a wire that has become loose or disconnected. Check all wires for security before calling our helpline for assistance. There are 6 sensors in total. The ATC have black tails and the BTC have blue tails. The resistance/temperature tables for the ATC and BTC sensors are given in Figures 13-2 and 13-3. 6. The pressure gauge on the side of the heat pump measures refrigerant pressure not water pressure and is a useful tool to help fault finding. If the heat pump goes out on high pressure, it will almost certainly be as a result of an air-lock. An air-lock that cannot be cleared by the pump will have the same effect as that of an ordinary boiler. It will overheat as it cannot get rid of the heat it is producing. This will be evident if, when switched on from cold or warm, the gauge rises quickly towards the yellow or red zones. If this happens, switch off, and purge the system. (Remember to check the circulating pump is working.) In normal working conditions, the pointer on the gauge will remain in the green zone. 7. Capacitors store an electrical charge. Small capacitors are found in all domestic electronics and cause no danger. However, the capacitors in a heat pump are power capacitors and will give a large electric shock if care is not taken. DO NOT try to test the functionality of a capacitor using a screwdriver or multi-meter and NEVER try to short out the connections – even with the mains voltage removed. Seek the help of a qualified electrician or a qualified heating engineer who has been trained by Grant Engineering. 8. This is a repeat of note 5. If the heat pump goes out on high pressure, it will almost certainly be as a result of an air-lock. An air-lock that cannot be cleared by the pump will have the same effect as that of an ordinary boiler. It will overheat as it cannot get rid of the heat it is producing. This will be evident if, when switched on from cold or warm, the gauge rises quickly towards the yellow or red zones. If this happens, switch off, and purge the ...

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