Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
CH Demand
CH temperature control turned to MAX
Disconnect inline connector to flow switch
Disconnect inline connector to flow switch
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance.
Measure the resistance across the pins of the inline connector which connects to the flow switch (see note)
Expected resistance continuity / zero resistance.
Note.
If there is no flow switch fitted on the appliance then select 'Resistance as expected'
Measure the resistance across the pins of the inline connector which connects to the flow switch (see note)
Expected resistance continuity / zero resistance.
Note.
If there is no flow switch fitted on the appliance then select 'Resistance as expected'
Isolate as per TOPs P4
and refit as necessary