17
TROUBLESHOOTING HEATING SYSTEM - LOWER CYLINDER
Problem
Possible cause of fault
Possible solution
Heating system provides
little or no room heating
The facility lacks power
Check the fuses and power supply wires
Circulation pump is out of operation.
Listen or feel the pump (NB: the pump may
be hot) to check whether it is running. If no:
Contact auth. installer.
There is air in the system
If an external heat source is fitted, check its
instructions for ventilation. In electric-only
operation, the system is vented via bleed
valves etc. Any radiatos are vented individ-
ually. Contact auth. Installer when needed.
Return valves are set incorrectly
Check that return valves provide the cor-
rect throttling. Contact auth. Installer when
needed.
The heating system safety
valve is dripping/running
The expansion tank is defective
Open the air filling valve on the tank. If wa-
ter is leaking out, the vessel is broken and
must be replaced.
The pressure in the heating system is
too high
Check the system pressure. Normal oper-
ating pressure is 1-2 bar. Contact auth. In-
staller when needed.
The valve is defective
Replace the valve. Contact auth. installer.
The heating circuit has to
be refilled frequently
Leak in the heating system
Check all pipe couplings. Turn off the pow-
er supply, remove the lid on the junction
box in the lower cylinder and check leak-
age from heating elements. If there is a leak
from the element: Gasket needs to be re-
placed. Contact auth. installer.
The cover should be fitted before switching
on the power.
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.
Summary of Contents for OC 300 HT
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