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6. TROUBLESHOOTING
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-
Problem
There is leakage/dripping
from the safety valve/
there is often water on the
floor by the cylinder in the
morning
No hot water
Not enough hot water
Not high enough tem-
perature
Fuse/earth breaker trips
repeatedly
Long time before the
water reaches the tap
Knocking in the pipes
when the hot tap is closed
14
TROUBLESHOOTING
Possible cause of fault
Pressure reduction valve, water meter or
blocked non-return valve on the water
intake.
Water pressure into the home is too
high.
The safety valve is worn or there are par-
ticles stuck between the membrane and
the valve seat because the water is dirty
Leak from heating element.
Power supply interrupted.
Thermostat has cut out.
Heating element is defective.
Leak in hot water pipe
High consumption in the home.
The mixer valve is set for low tempera-
tures.
The thermostat is set for low tempera-
tures.
Change from cold to hot water in taps.
Possible fault in the heater's electrical
system.
Long stretch of pipe from water heater
to tap.
Large pressure increase when the tap
is closed quickly.
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.
Possible solution
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.
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. Contact auth. installer.
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.
Verify that the fuse is on / the plug is
plugged in to the wall contact / the earth
breaker has not tripped.
Press the 'RESET' button on the safety ther-
mostat; see 'User guide'.
Replace heating element. Contact auth. in-
staller.
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.
Raise the temperature on the thermostat to
85°C; see 'User guide'.
Switch to a larger OSO water heater. Con-
tact auth. installer.
Raise the temperature on the mixer valve;
see 'User guide'.
Raise the temperature on the thermostat to
85°C; see 'User guide'.
Contact auth. installer.
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.
Fit circulation wire or heating cable to HW
pipe. Or fit an auxiliary heater by the tap.
Contact auth. installer.
Completely normal. Fit AX expansion ves-
sel if troublesome. Contact auth. installer.
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