Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
For access behind the control panel
Release the fixing screw located at the top of the case front panel and lift the panel upwards from its locating pins and then forwards from the boiler. Remove the two fixing screws that secure the control panel and lower the panel.
Release the fixing screw located at the top of the case front panel and lift the panel upwards from its locating pins and then forwards from the boiler. Remove the two fixing screws that secure the control panel and lower the panel.
Measurement:
Disconnect pump live, neutral and earth from the main terminal strip
Check resistances across the disconnected leads resistances should conform to the table below.
Note:
Pump resistance will depend on speed setting.
Check resistances across the disconnected leads resistances should conform to the table below.
Note:
Pump resistance will depend on speed setting.
| Test | Leads | Expected Resistance(Ohms) |
| 1. | Pump Live & Pump Neutral | 170/500 |
| 2. | Pump Live and Earth | Infinity (O L) |
| 3. | Pump Neutral and Earth | Infinity (O L) |
Isolate as per TOPs P4
and refit as necessary