English (GB)
15
9. Fault finding
9.1 Positive-head pumps (STP, SSP, STR2, SSR2)
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) Insufficient water flow, below 0.5 l/min.
Increase the water flow to at least 0.5 l/min.
2. The pump runs but
delivers no water.
f)
Isolating valves are closed.
Open the isolating valves.
g) 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.
4. The pump runs
continuously.
a) A tap or outlet is open.
Ensure that there are no leaks and that all taps and
appliances are closed.
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.
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.
Ensure that taps or other outlets are not causing water
hammer. A low-pressure non-return valve can be fitted
on the outlet pipe from the pump. Contact your installer.
6. Unstable water
temperature or noisy
pump.
a) Air entering the pump, most commonly from
the hot-water cylinder.
Fit a Surrey flange and study the pipe layout. There
should be no high points where air can collect.
b) Too high water temperature.
Reduce hot-water temperature. The maximum hot-water
temperature setting is 60 °C.
c) Debris caught in the impeller casing.
Remove debris.
7. Noisy pump.
a) Vibration through pump mounting surface.
Place the pump on a concrete slab to reduce noise.
8. Hose connection
leaking.
a) Hose connection loose.
STR2 and SSR2: Make sure that the hose washers and
strainer washers are fitted. Check that the plastic nuts
on the hoses are tight.
STP, SSP: Make sure that the hose connection is fully
inserted to a minimum depth of 33 mm.
If correction of any of the above did not ensure
successful operation, please call the Service
Helpline before removing the pump from the
installation:
UK: 01525 775460
ROI: 01-4089800
Summary of Contents for SSN
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