Section 8
-
Fault finding
Page 12
05/20 E&OE
FAULT FINDING
If there are no error messages or fault lights, then firstly switch off power to the unit, wait for 10 seconds and then
re
-
start the unit as this will re
-
set the stepper motors.
If the unit still does not operate, then the next step is to check all wiring is correctly connected to the right
component, especially if connectors have been taken off at any stage. Refer to Appendix 2 for wiring explanation.
Fault
Possible Causes
Action
‘
District
’
water not
entering the unit.
Blocked strainer
Solenoid valve not
operating correctly.
Unscrew the strainer cap bolt and take the strainer out, ensur-
ing you have isolated unit and waited for water to cool down.
Clean or replace accordingly.
Ensure there is positive pressure between inlet and outlet of
valve.
Check that 24V is being supplied to the DC coil.
If above does not resolve issue, replace solenoid coil.
No Hot Water or
Heating
Electronics in Fault Mode
Solenoid valve not
operating
Control Valve not
operating or Diverter
Valve no operating
Pump not operating
Hot Water Flow sensor
not working
Safety klixon switch
tripped
[if fitted]
‘
District
’
water tempera-
ture too low
Low pressure, re
-
fill and it will re
-
set
See above
Check that 24v is being supplied to either or both DC Coils. If
both OK, then replace the faulty stepper motor
Check that impeller has not seized.
Check you have 240 volts going to pump.
If above does not resolve issue, replace pump
Flow rate is below 2.6l/m
If light on with no flow replace the sensor electronic.
If light doesn
’
t come on with a flow rate of more than 2.5l/m
replace sensor electronic
Review why klixon has tripped out and re
-
set electronics
If above does not resolve issue, replace klaxon.
Check
‘
District
’
supply conditions
Low Hot Water
flow rate
Heat Exchanger blocked
Blocked cold water
strainer
Flush Heat Exchanger or replace
Take out flow sensor cartridge and check and clean strainer
-
V3 DIRECT
