Set Appliance State:
Set Multimeter to Resistance 
Isolate Mains Power to appliance as per TOPs P4
On/Off Switch in ON position
Mode Selector Switch to Constant
IMPORTANT: Once the boiler is up to temperature,
turn mode selector switch to summer
On/Off Switch in ON position
Mode Selector Switch to Constant
IMPORTANT: Once the boiler is up to temperature,
turn mode selector switch to summer
Measurement:
Measure Mains Voltage across connections 32 L (Brown) and Neutral (Blue)
NOTE 1: The boiler must have reached its operating temperature before this test can be carried out.
NOTE 2: It may be necessary to turn off some radiators for this test.
This will assist the boiler to reach operating temperature and speed up the test.
NOTE 1: The boiler must have reached its operating temperature before this test can be carried out.
NOTE 2: It may be necessary to turn off some radiators for this test.
This will assist the boiler to reach operating temperature and speed up the test.
Isolate as per TOPs P4
and refit as necessary