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13. Troubleshooting
Problem
Cause
The appliance will not
The aerator in the tap
start despite the DHW
is scaled up or dirty.
valve being fully open.
The sieve in the cold
water line is blocked.
The heater is faulty.
The safety pressure
limiter has responded.
Remedy
Clean and/or descale
the aerator or replace
the special aerator.
Clean the sieve after
shutting off the cold
water inlet line.
Check the resistance
of the heating system
and replace the appli-
ance if required.
Remedy the cause of
the fault. Isolate the
appliance from the
power supply and de-
pressurise the water
line. Activate the safe-
ty pressure limiter.
Installation - for contractors
Activating the safety pressure limiter
1
2
1 1-pole safety pressure limiter MTD 440 / MTD 570
2 2-pole safety pressure limiter MTD 350 / MTD 650
33
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Troubleshooting
