| 8 FAULT FINDING. |
8.1  IMPORTANT: If an electrical fault occurs after installation of the appliance, preliminary earth continuity, polarity, and resistance to earth checks should be carried out with a multimeter. On completion of any service/fault-finding task which has required the breaking and remaking of electrical connections, then checks of continuity, polarity, and resistance to earth checks must be repeated. |
| 8.2 Store Not Full - as indicated by red neon on wiring centre Refer to Section 6 Filling. |
| 8.3 No Hot Water / Luke Warm Water |
| 8.3.1 Heat Bank Thermal Store Not Full Refer to Section 6 - Filling. |
| 8.3.2 Electrical Supply to controls not turned on Turn on. |
| 8.3.3 Fuse Blown Check and replace if required. Ensure that a fuse of the correct rating is used (3 Amps to controls). |
| 8.3.4 Heat Exchanger Pump jammed Jump start pump using screw driver on pump spindle. If pump does not turn freely then replace. IMPORTANT: The unit should be protected with scale / corrosion inhibitor to protect the pump. A build up of material within the pump suggests that inhibitor has not been used, and the system will probably need flushing. |
| 8.3.5 Flow Switch not operating Check as follows |
| 8.3.5.1 Using an electrical tester, check that there is a live to the Flow Switch (brown wire). |
| 8.3.5.2 Ensure that all hot water outlets are closed and that the return from the Flow Switch (blue wire) is not live. |
| 8.3.5.3 Check that the return from the Flow Switch goes live when a hot water outlet is turned on. If not then replace Flow Switch. |
| 8.3.6 Thermostatic Blending Valve setting too low Increase to suit |
| 8.3.7 Setting on Heat Exchanger Pump is too low for required hot water flow rate Increase pump setting or reduce draw off flow rate. |
| 8.3.8 Faulty Immersion Heater Check that heater draws correct current (12.5A / 3KW) using a suitable Ammeter. Replace if required. |
| 8.3.9 Immersion Heater Thermostat set too low Set between 80°C and 85°C |
| 8.3.10 Immersion Heater Overheat Thermostat tripping Reduce setting of Control Thermostat to eliminate nuisance tripping. If this does not help then replace Control Thermostat. |
| 8.3.11 Heat Exchanger blocked Power flush |
| 8.4 Hot water supply too hot. |
| 8.4.1 Thermostatic Blending Valve set too high Reduce setting to provide water at desired temperature. |