Fault Diagnosis - Mira Enduro Installation & User Manual

Symptom
1. Pump does
not start.
Pump has
been in use
and stopped
within short
period
2. Pump
operates
momentarily
when not
required.

FAULT DIAGNOSIS

Cause
(a) No power.
(b) No/low flow
through
terminal fittings
(flow switch
needs typically
0.5 l/min).
(c) Internal
problem.
(d) Motor thermal
switch tripped.
(a) Flow-switch
operating due
to water
movement in
pipework.
(b) Flow-switch
reed/PCB
tripping.
Rectification
1. Check all fuses and RCD. Ensure
power is available at pump terminal
box.
If fuse "blows" repeatedly, refer to
6(b).
1. Clean shower heads, ensure flow
controls are operating correctly.
2. Check for air locks.
3. Check for isolating valves not fully
open, other restrictions.
4. Check system has adequate static
head and flow potential (refer to
Operation on page 6) .
5. Flow switch mechanism sticking.
1. (New installation). Check wiring in
electrical boxes (refer Fig. 8).
2. Check continuity of flow-switch reed
(see Note 1 at end of section).
3. Pump impeded internally, refer to
6(b).
1. Allow motor to cool (up to 1 hour).
Refer to 6 (c).
1. Air pocket after pump. Locate and
ensure adequate venting.
2. Air pocket in pump supply (hot)
expanding due to system heating.
Correct pipework layout to eliminate
thermal flow, fit a single check valve
close to and after pump outlet (see
Note 2 at end of section).
1. Local source of strong electro-
magnetic/radio transmission. Shield
flow-switch reed (tinfoil).
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