- Reaction score
- 10,215
Firstly preparation - understand the system you are looking at, find out what kind of plan it is and download the wiring set-up for this system - then go to check it is wired as it should be, how do you expect to be competent in fault finding in a system you haven't checked that it is initially connected up correctly ..... the system should have been fully tested to operate in all states before you left the last time if you lack the plumbing knowledge to understand the way the system functions you liaise with the plumber till you can understand the sequence of operation when calling for hot water or heating. You can isolate section while powered down and eliminate them as possible faults, whith the plumbers input try manually switching the valve testing as you go ... be careful with insulation tester when electronics are connected like the clock or boiler...... i am in my job forced to test my machine faults without wiring plans or instructions as the equipment is usually 50-70 yrs old without off the shelf part replacement but given the chance if available i always familiarise myself with the schematics and liaise with the operator to identify possible likely areas at fault..... half the time its mechanical issues or operator error and the electrics work fine ...... this is the worst thing trying to find a fault that doesn't exist because the operator has left the gearing in the wrong set-up.