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Symptom
5. Pump
switches off
while in use
(continued)
6. Leak from
pump
housing.
Note 1. Flow-switch continuity should be checked with power switched off and one
flow-switch lead disconnected. Use appropriate continuity meter. Correct
operation is open circuit with no flow, and closed circuit with flow.
Note 2. Fitting a check valve is a secondary measure, initially the cause of water
surge should be investigated and rectified. The single check valve should be of
spring-loaded pattern and fitted in discharge pipework. This may increase the mini-
mum head pressure required to operate flow-switch.
Cause
(d) Motor fault.
(a) Seal worn/
damaged.
(b) Inlet pressure
above
maximum
permitted
Rectification
1. If free movement:-
- if motor winding and bearings are
satisfactory, renew capacitor.
- test continuity of motor windings.
If no continuity, short-circuit exists
in windings (non-serviceable
assembly). Renew Mira Enduro
pump.
If no free movement:-
- refer to 4(b).
- probable motor bearing failure (non-
serviceable assembly). Renew Mira
Enduro pump.
1. If leak is from rear of impeller
housing, at junction with motor
assembly, mechanical seal requires
renewal.
2. If leak is from perimeter of impeller
housing, then housing seals require
renewal.
3. See Specifications on page 8.
20
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