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Symptom
3. Pumped
flow/
pressure is
initially
adequate,
but reduces
after short
time.
4. Pump is
noisy in
operation.
N.B. All
pumps
generate
some noise.
Installation
conditions
may allow
this to be
amplified.
5. Pump
switches off
while in use.
Cause
(a) Water supply
fault.
(a) Installation
fault.
(b) Pump impeded
internally.
(a) Power supply
fault.
(b) Water supply
fault.
(c) Motor thermal
switch tripped.
Rectification
1. Check that hot and cold storage
volumes are sufficient for demand.
2. Check that all supply strainers
(including mixing valve) are clean.
3. Pipework configuration and/or water
supply conditions are allowing air
induction.
1. Vibration from pump body
transmitted through reverberant
material. Check pump position and
pipework securings.
Note! The pump should be free
standing on its rubber feet, and not
screwed down.
2. Fault in supply to pump. Refer to 3.
1. Check for debris and/or damage in
impeller housing.
2. Mechanical seal worn/damaged.
Renew.
3. Motor fault. Refer to 5 (d).
1. Check all fuses and RCD. Ensure
power is available at pump terminal
box.
1. Refer to 3.
1. Allow the motor to cool (up to 1 hour)
2. Check ambient air temperature
around pump does not exceed 40
3. Make sure adequate free ventilation
is provided (minimum clearance of
80 mm around all sides of pump).
4. Pump impeded internally. Refer to
4(b).
19
o
C.
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