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For the user and the qualified installer
Cause
• No electrical power.
• The turn on flow rate needed
to switch on the heating
power has not been reached.
Soiling or furring of the jet
regulator.
• Jet regulator furred or soiled.
• Filter soiled.
• No electrical power.
• Heating system defective.
Remedy
• Check the fuses in the house
installation.
• Clean or if necessary renew
the jet regulator (see „2.12
Special accessories“).
• Clean or if necessary renew the
fitting jet regulator (see „2.12
Special accessories“).
• Clean the filter in the cold
water inlet (1) after shutting
off the water supply.
• Check the fuse
(house installation).
• Measure heating system
resistance, if necessary
exchange the unit.
Fault
No hot water despite fully
opened hot water fitting.
Flow too weak.
Heating fails to switch on /
no hot water.
2.12 Fault elimination
Fault elimination by the user
Fault elimination by the qualified installer
English
MTH 350 DE_GB.p65 14.04.2004, 10:4517