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/drip-
ping from the safety
valve/there is often
water on the floor by the
cylinder in the morning
Pressure reduction valve, water me-
ter 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
adjusted in according to the pressure in the
expansion vessel. Contact auth. installer.
The safety valve is worn or there are
particles stuck between the mem-
brane and the valve seat because
the water is dirty
Try to flush with water through the safe-
ty valve. Open valve approx. 1 minute.
See section 5.2. If the valve still leaks, it
must 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.
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
thermostat; see ‘User guide’.
Heating element is defective.
Replace heating element. Contact auth.
installer.
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 tem-
perature
The mixer valve is set for low tem-
peratures.
Raise the temperature on the mixer
valve; see ‘User guide’.
The thermostat is set for low tem-
peratures.
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 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 ves-
sel if troublesome. Contact auth. installer.
