48
BOXER
combination boiler -
Installation and Servicing
FAULT FINDING
F
A
U
L
T FINDING F
A
U
L
T FINDING F
A
U
L
T FINDING F
A
U
L
T FINDING F
A
U
L
T FINDING
NO
YES
IS THE BURNER PRESSURE
CORRECT (DATA TABLE 2)
IS THERE >17mbar INLET
PRESSURE AT THE GAS
VALVE
RECTIFY GAS SUPPLY
FAULT
ADJUST THE BURNER
PRESSURE
DO THE RADIATORS GET HOT
REPLACE FAULTY
THERMOSTATIC
ELEMENT IN 3 WAY VALVE
RECTIFY EXTERNAL
SYSTEM FAULT
ENSURE ALL VALVES
ARE OPEN WITH THE
SYSTEM VENTED AND
PRESSURISED
SWITCH THE CH DEMAND OFF
AT THE SELECTOR SWITCH.
OPEN A DHW TAP. DOES THE
WATER GET HOT
REPAIR OR REPLACE
FAULTY WIRING OR
THERMISTOR
REPLACE FAULTY PCB
ENSURE THERE IS
SUFFICIENT WATER
PRESSURE AND THE
SUPPLY PIPE IS ADEQUATE
CLEAN INLET FILTER AND
FLOWSWITCH.REPLACE
FAULTY FLOWSWITCH IF
NECESSARY
REPAIR OR REPLACE
FAULTY WIRING
CHECK THE 3 WAY VALVE
THERMOSTATIC ELEMENT.
IS THE SPINDLE FULLY
RETRACTED
IS THE SYSTEM FULLY
VENTED WITH ALL
ISOLATOR VALVES FULLY
OPEN AND THE SYSTEM
PRESSURE IS >1bar
DISCONNECT PLUG A6 IS
THE RESISTANCE ACROSS
PIN 1 AND PIN 2 BETWEEN
0.5kohm TO 50kohm
IS THERE CONTINUITY
ACROSS THE DHW
FLOWSWITCH
IS THE CONTINUITY OF
THE DHW FLOWSWITCH
LEAD OK ACROSS PINS 3
AND 4 AT CONNECTOR A6
NO
NO
NO
NO
IS THERE A WATER
FLOWRATE OF APPROX 10l/
min (6 secs TO FILL A 1LITRE
CONTAINER)
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES