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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
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 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.
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
adjusted in according to the pressure in the
expansion 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 for approx. 1 minute. If the
valve still leaks, it must be replaced. 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. Con-
tact auth. installer.
Not enough hot water
High consumption in the home.
Raise the temperature on the thermostat
to 70°C; see ‘User guide’.
Switch to a larger OSO water heater. Con-
tact auth. installer.
Not high enough tem-
perature
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 70°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
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 ves-
sel if troublesome. Contact auth. installer.
Summary of Contents for Delta Coil DC 200
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