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Troubleshooting
Problem/Symptom
Electric Water
Heater no power.
Water flow too
low.
NOTES
It is advised all electrical maintenance/
repairs to the shower should be carried
out by a suitably qualified person.
In the unlikely event of Electric Water
Wiring Diagram
E
Cause
Incoming water
flow too low.
Electrical malfunction
of Electric Water
Heater.
Safety Thermostat
cut-out operated.
3 in 1 Stop Valve
Filter/Mesh Filter
blocked.
3 in 1 Stop Valve not
fully open.
Water supply
insufficent.
N
L
Manual Reset
Thermal
Cut- Out
& Thermostat
TRIAC
Heater
Action/Cure
Adjust the 3 in 1 Stop valve.
Contact Viessmann Customer Service
Call Centre.
Safety Thermostat cut-out operated.
Contact Viessmann Customer Service
Call Centre.
Clean the filter.
Open 3 in 1 Stop Valve to desire flow
rate.
Check house water supply.
Heater failure other than detailed in the
fault finding page, please contact
Viessmann Customer Service Call
Centre for advice.
T2
G
Power ON/OFF
N1
Temp. Control
T1
Manual Reset (90 C Thermostat)
For Models rated 4.5kW and below,
thermostat is manually resetable.
Led Board
FS
Flow
Switch
FS
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