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7.3 FAULT FINDING - CENTRAL HEATING PRIMARY CIRCUIT
FAULT
POSSIBLE CAUSE
REMEDY
No heat
No electrical supply
Check electrical supply and
switch on.
Room thermostat fuse
Check fuse on Electromax
Solar control panel. Replace if
necessary
Electric boiler main PCB fuse
Check fuse on electric boiler
main PCB. Replace if neces-
sary
Programmer not set
Check settings and re pro-
gramme if necessary
Internal wiring
Check all electrical connections
are correct and tight.
Room thermostat
Check for above faults. Manu-
ally set room thermostat to call
for heat. Replace room thermo-
stat if found to be faulty.
Boiler element failure
Check element resistance, re-
place boiler if below 19 ohms.
Faulty PCB’s
Check for above faults. If none
are present replace electric
boiler main PCB and / or elec-
tric boiler display PCB
Pressure gauge reading low
Leak
Check pipework for signs of
leaks and repair if required and
re fill system.
PRV operating
Check expansion valve 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 solar
primary system.
No circulation
Pump seized
Check the impeller can be ro-
tated using a screwdriver after
removing the air bleed screw.
Faulty electric boiler PCB
See above
Isolation valves closed
Check valves and open if nec-
essary
Faulty pump
Check for above faults. If none
are present replace central
heating circulating pump