14
6.1 Faults and fixes
If problems arise when the product is in use,
check for possible faults and fixes in the table. If
the problem is not shown in the troubleshoot-
6. TROUBLESHOOTING
ing table or you are unsure what is wrong, con-
tact the installer (see type plate on the product)
or OSO Hotwater AS - see section 7.1.
TROUBLESHOOTING
Problem
Possible cause of fault
Possible solution
There is leakage/dripping
from the safety valve/
there is often water on the
floor by the cylinder in the
morning
Pressure reduction valve, water meter or
blocked non-return valve on the water in-
take.
Water pressure into the home is too high.
Fit AX expansion vessel with absorbs expansion
during heating, and fit pressure reduction valve
for stable water pressure inside the home. The
pressure reduction valve is adjusted in according
to the pressure in the expansion vessel. Contact
auth. installer.
The safety valve is worn or there are parti-
cles stuck between the membrane and the
valve seat because the water is dirty
Try to flush with water through the safety valve.
Open valve for approx. 1 minute. See section 5.2.
If the valve still leaks, it must be replaced. Con-
tact auth. installer.
Leak from heating element.
Verify as follows: a) cut the electric supply, b) un-
screw the cover, c) visually check whether there
is a leak from the heating element. If so, replace
the gasket/heating element. Contact auth. in-
staller.
No hot water
Power supply interrupted.
Verify that the fuse is on / the plug is plugged
in to the wall contact / the earth breaker has
not tripped.
Thermostat has cut out.
Press the ‘RESET’ button on the safety thermo-
stat; see section 5 ‘User guide’.
Heating element is defective.
Replace heating element. Contact auth. in-
staller.
Leak in hot water pipe
Verify as follows: a) close the water supply, b)
wait 2-3 hours, c) feel the hot water hose to
see whether it is hot. If so, there is a leak in
the hot water pipe or elsewhere. Contact auth.
installer.
Not enough hot water
High consumption in the home.
Raise the temperature on the thermostat to
75°C; see section 5 ‘User guide’.
Switch to a larger OSO water heater. Contact
auth. installer.
Not high enough water
temperature
The thermostat is set for low tempera-
tures.
Raise the temperature on the thermostat to
75°C; see section 5 ‘User guide’.
Change from cold to hot water in taps.
Contact auth. installer.
Fuse/earth breaker trips
repeatedly
Possible fault in the heater’s electrical
system.
Verify as follows: a) cut the electric supply, b) un-
screw the cover, c) visually check the junction box
for any problems. If so, contact auth. installer to
check. Fit the cover.
Long time before the water
reaches the tap
Long stretch of pipe from water heater
to tap.
Fit circulation wire or heating cable to HW
pipe. Or fit an auxiliary heater by the tap.
Contact auth. installer.
Knocking in the pipes when
the hot tap is closed
Large pressure increase when the tap is
closed quickly.
Completely normal. Fit AX expansion vessel if
troublesome. Contact auth. installer.
