English (GB)
16
9.2 Universal-head pumps (STN, SSN, STR2 CN and SSR2 CN)
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
One of the most common causes of pump problems
is air in the system.
Fault
Possible cause
Remedy
1. The pump fails to start. a) The power supply is switched off.
Switch on the power supply.
b) The fuses are blown.
Replace the blown fuses. If the new ones blow too, check
the electrical installation.
c) The built-in thermal protection has
switched off the motor.
The thermal protection resets automatically within one to
two hours.
d) Pump installed with non-vertical outlet
ports (flow switches).
The pump must be installed with vertical outlet ports (flow
switches).
e) Dry-running protection activated.
Switch off the power supply for ten seconds to reset.
See section
7.2 Dry-running protection
to eliminate the
cause.
f)
Faulty or incorrectly set pressure switch.
Contact the helpline for adjustment or replacement details.
2. The pump runs but
delivers no water.
a) Isolating valves are closed.
Open the isolating valves.
b) Strainers are blocked.
Close the isolating valves, clean the strainers and re-open
the valves.
3. The flow from the
shower drops.
a) Strainers are blocked.
Close the isolating valves, clean the strainers and re-open
the valves.
b) Air in the system.
Purge any air in the system. With the pump not running,
allow maximum flow by removing the shower handset and
allowing the hose to hang into the shower tray or bath.
Operate maximum hot and cold flow for at least five
minutes each. For fixed-head showers, remove the shower
rose and connect a length of hose hanging into the shower
tray or bath.
4. The pump runs
continuously.
a) A flow demand still exists.
Check the installation for leaks.
b) Faulty pressure switch.
Contact the helpline for adjustment or replacement details.
c) The float in the flow switch is stuck in the
up (on) position.
Make sure that the flow switch can operate correctly and
there is no debris in the flow switch.
d) Flow switch or reed switch faulty or
incorrectly set.
Adjust or replace as appropriate.
5. The pump pulses.
a) The use of other taps in the house may
cause the pump to start momentarily.
Contact your installer.
b) Leaks in the system.
Check the system for leaks.
c) Faulty non-return valve.
Check the non-return valves and replace, if necessary.
6. The pump does not run
even though there is a
demand.
a) Flow demand below 0.5 l/min.
Open a tap to increase the flow demand.
b) Flow switch or reed switch faulty.
Replace the flow switch or reed switch.
c) Dry-running protection activated.
Switch off the power supply for ten seconds to reset. See
section
7.2 Dry-running protection
.
7. Pump hunts when
shutting down.
a) Incorrect tank air-pressure setting.
Adjust the tank air-pressure setting.
b) Insufficient run-on time.
Replace the printed-circuit board (PCB).
8. Pump hunts when
starting up.
a) Flow rate below 0.5 l/min.
Increase the flow rate.
b) Flow switch or reed switch faulty or
incorrectly set.
Adjust or replace as appropriate.
9. Noisy pump.
a) Vibration through pump mounting surface. Place the pump on a concrete slab to reduce noise.
10. Hose connection
leaking.
a) Hose connection loose.
STR2 CN and SSR2 CN: Make sure that the hose washers
and strainer washers are fitted. Check that the plastic nuts
on the hoses are tight.
STN, SSN: Make sure that the hose connection is fully
inserted to a minimum depth of 33 mm.
Summary of Contents for SSN
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