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7.2. FAULT FINDING - SOLAR PRIMARY CIRCUIT
FAULT
POSSIBLE CAUSE
REMEDY
Pressure gauge reading Low
Leak
Check pipework for signs of
leaks and repair if required and
re fill system.
PRV operating
Check discharge container for
signs of discharge. Identify rea-
son and rectify. Re Fill system.
Expansion vessel
Check charge pressure and re
charge if required.
Faulty gauge
Check system pressure. Re-
place gauge if found to be
faulty.
Incorrect set up
Check for above faults. If none
are present initial set up may
be wrong. Re commission So-
lar primary system.
No display on solar controller
No electrical supply
Check electrical supply and
switch on.
Fuse
Check fuse. Replace if neces-
sary
Solar thermal cutout has oper-
ated.
Check solar thermal cut out. Re
set if necessary
Internal wiring
Check connections at solar
PCB are correct and tight.
Faulty solar control PCB
Check for above faults. If none
are present replace Solar
controller and / or solar display
PCBs
Erratic readings on solar con-
troller
Sensor cables laid next to
mains voltage cables.
Ensure there is a minimum of
50mm between mains voltage
and sensor cables
Sensor cables are not shielded. Check sensor cables and re-
place if necessary
Internal wiring
Check connections at solar
PCB are correct and tight.
Faulty controller
Check for above faults. If none
are present replace Solar
controller and / or solar display
PCBs
No circulation
Pump seized
Check the impeller can be ro-
tated using a screwdriver after
removing the air bleed screw.
Faulty solar control PCB
See above
Isolation valves closed
Check valves and open if nec-
essary
Faulty pump
Check for above faults. If none
are present replace solar circu-
lating pump
