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
No hot water
Power supply interrupted.
Check that the fuse is set and the earth
breaker has not tripped.
Thermostat has cut out.
Press the ‘Safety’ button on the safety
thermostat; see ‘User guide’.
Heating element is defective.
Replace heating element. Contact auth.
installer.
Leak in hot water pipe
Verify as follows: a) close all hot water
taps, b) wait 2-3 hours, c) feel the hot wa-
ter outlet pipe to see whether it is hot. If
so, there is a leak in the hot water pipe or
elsewhere. Contact auth. installer.
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 wa-
ter intake.
Water pressure into the home is too
high.
Fit AX expansion vessel with absorbs ex-
pansion during heating, and fit pressure
reduction valve for stable water pressure
inside the home. The pressure reduction
valve is adjusted in according to the pres-
sure in the expansion vessel. Contact auth.
installer.
The safety valve is worn or there are
particles 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.
If the valve still leaks, it shall be replaced.
Contact auth. installer.
Leak from heating element.
Verify as follows: a) cut the electric sup-
ply, 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.
Not enough hot water
High consumption in the home.
Raise the temperature on the thermostat
to 75°C; see ‘User guide’.
Switch to a larger OSO water heater. Con-
tact auth. installer.
Not high enough tem-
perature
The thermostat is set for low tem-
peratures.
Raise the temperature on the thermostat
to 75°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 electri-
cal system.
Verify as follows: a) cut the electric supply,
b) unscrew the cover, c) visually check the
junction box for any problems. If so, con-
tact 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.
