Trianco TRISTAR OPTIMA JUNIOR K CB, Installation Instructions Manual, Page: 39 / 44

39
After an appliance malfunction, the boiler will enter a lock-out state (indicated by the illumination of LED ‘ H ’). The
multifunction display will show a three-digit fault code. In most cases, the fault can be eliminated by switching the
boiler off then on, using
ON/OFF button ‘ A ’. An attempt can also be made to reset the operation by holding reset
button ‘ D ’ for two seconds. The boiler will perform a self-diagnostic cycle and restart if the problem has been
eliminated. If the problem persists, refer to the comprehensive list of fault codes ( section 13.1 , page 40 )
FAULT
‘E02’ fault code shown
on the multifunction
display: Pressure
gauge needle has
dropped below set
pressure.
‘S01’ or ‘A01’ fault code
will be shown on the
multifunction display.
At initial startup, the
burner fails to start.
Required room
temperature not
reached.
Required room
temperature exceeded.
Heating/hot water not
operating.
Heating remains on too
long.
Hot water temperature
too low or too high.
POSSIBLE CAUSE
Water pressure too low.
Gas supply to appliance has
been interrupted
Radiator valves set too low.
Room thermostat set too low.
Central heating temperature set
too low on boiler.
Air trapped in heating system.
Radiator valves set too high.
Room thermostat set too high.
Central heating temperature set
too high.
Room thermostat/programmer
not calling for heat
Faulty cylinder thermostat.
No power to boiler.
Room thermostat/programmer
incorrectly set.
Programmer incorrectly set.
DHW temperature set wrong
- Combi (CB) model only
Incorrect cylinder stat settings.
SOLUTION
Reset the pressure to the correct setting by
gradually opening the filling loop on the
underside of the boiler. Close the loop once the
desired pressure has been reached. Switch the
boiler off then on, using
ON/OFF button ‘ A ’.
If the problem persists, check the installation, as
in most cases there will be a heating system,
rather than boiler fault.
Check the gas supply/switch on at valves and
press reset button ‘
D ’.
Increase settings on radiator valves.
Increase settings on room thermostat.
Increase temperature setting by turning knob ‘ B ’
clockwise.
Bleed radiators of air and re-pressurise heating
system.
Decrease settings on radiator valves.
Decrease settings on room thermostat.
Decrease temperature setting by turning knob ‘ B ’
anti-clockwise.
Check settings on room thermostat/programmer.
Change cylinder thermostat
Check power supply is active, that isolation
switch is switched
ON .
Check settings on room thermostat/programmer.
Check settings on programmer.
Adjust temperature setting by turning knob ‘ C ’
clockwise (higher) or anticlockwise (lower).
Adjust cylinder stat settings.
13 FAULT-FINDING