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Megalife Product Guide
9.3 Fault Finding
The fault finding chart below will enable operational faults to be identified and their possible causes rectified. Any work
carried out on the Megalife solar water heater and its associated controls
MUST
be carried out by a competent installer
for water heating systems. In case of doubt contact the Heatrae Sadia Service Department (see back page).
Table 02: Fault Finding
Fault
Possible Cause
Remedy
No hot water flow
1. No water in cold feed cistern
2. Service valve in cold water feed pipe
from cistern turned off
3. Air lock in system
4. Inadequate head between outlet
and cold water feed cistern
1. Check water supply to cold cistern
2. Turn on services valve
3. Check pipework layout for possible air lock-
ing points, recify as necessary
4. Check minimum head requirement of outlet
fitting
Hot water flow gradu-
ally decreases
1. Outlet flow rate exceeds inlet flow to
cold water feed cistern
2. Flow starvation caused by opening
further outlets
1. Install higher flow float valve. Consider
larger cold water cistern storage capacity
2. Check pipe sizings and layout. Consider
restricting flow rate through lower taps
Water from tap is cold 1. INDIRECT programmer set to central
heating only
2. INDIRECT boiler not working
3. INDIRECT thermal cut-out has oper-
ated
4. INDIRECT motorised valve not con-
nected correctly
5. Solar, insufficient solar gain with no
auxillary heating switched on
1. Check, set to domestic hot water pro-
gramme
2. Check boiler operation. If fault is suspected
consult boiler manufacturer’s instructions
3. Check, reset by pushing button on cut-out.
Check operation of indirect thermostat
4. Check wiring and/or plumbing connections
to motorised valve (see figs 5 & 6, page 10)
5. Check auxillary heat source is switched on
and is controlled to provide heat gain if no
solar output is available
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