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 7.2.
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
intake.
Water pressure into the home is too high.
Fit AX expansion vessel with absorbs expan-
sion during heating, and fit pressure reduc-
tion valve for stable water pressure inside the
home. The pressure reduction valve is adjust-
ed in according to the pressure in the expan-
sion vessel. Contact auth. installer.
The safety valve is worn or there are par-
ticles stuck between the membrane and
the valve seat because the water is dirty
Try to flush with water through the safety
valve. Open valve approx. 1 minute. See sec-
tion 5.2. If the valve still leaks, it must be re-
placed. Contact auth. installer.
Leak from heating element.
Verify as follows: a) cut the electric supply, b)
unscrew the cover, c) visually check whether
there is a leak from the heating element. If so,
replace the gasket/heating element. Contact
auth. installer.
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 ‘User guide’.
Heating element is defective.
Replace heating element. Contact auth. in-
staller.
Leak in hot water pipe
Verify as follows: a) close the mixer valve, b)
wait 2-3 hours, c) feel the mixer valve 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
85°C; see ‘User guide’.
Switch to a larger OSO water heater. Contact
auth. installer.
Not high enough tempera-
ture
The mixer valve is set for low tempera-
tures.
Raise the temperature on the mixer valve; see
‘User guide’.
The thermostat is set for low tempera-
tures.
Raise the temperature on the thermostat to
85°C; see ‘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)
unscrew the cover, c) visually check the junc-
tion 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.
