Glow-worm COMPACT 80p Instructions For Use, Installation & Servicing page 25

TO TEST FOR COMPONENT OPERATION / FAILURE
Power to the appliance :- Test for 230V~ across live
(brown) and earth (yellow and green), 230V~ across live and
neutral (blue), and zero potential across neutral and earth.
Thermistors :- With the power off unplug the connector and
test resistance is 10kΩ at 25°C.
Domestic Hot Water demand sensor :- With a tap open
the supply to the sensor measure between the red and black
cables on X5a should be 12Vdc. The signal from the sensor
measured between the white and black cables X5a should
be between 1Vdc and 11Vdc dependent of the flow rate.
Overheat thermostat :- With the power off unplug the
connectors and test for continuity (zero resistance).
Power to the gas control valve :- With a demand on test
for voltages of 230Vac ~ across the red and purple cable
connectors and 24Vdc ~ across the grey and grey cable
connectors. When burner pressure at maximum.
Power to the fan :- With a demand on and the front cover
removed test for 230V~ at the fan connectors at high speed
and 108V at low speed
Fan failure :- with the power off and the supply leads to the
fan disconnected (pull the boots only) the resistance across
the fan coil should be 45Ω to 50Ω.
Pump :- With the power off unplug the connector from the
pump. Restore the power and check that there is 230V~
between live (brown) and neutral (blue) or live and the
appliance earth.
Air pressure switch :- This is a change over device. With
the fan at pilot only there should be 230V at the C and NC (No
air state terminals. With the appliance running and the fan
at full speed there should be 230Vac at C, Nc and No (Air
State).
Water pressure switch :- With no water pressure and
Power On, check there is 230V~ on the black and grey
cables and 0V on the grey cable X5b. With water applied to
the system and power on, check there is 230V~ on the black
and grey cables and on the white cable X5b. This will prove
operation of the water pressure switch.
Supplied By www.heating spares.co Tel. 0161 620 6677
13 Fault Finding
PERMANENT
MAINS 230V-50HZ
X5b
X5b
X5b
MAINS FUNCTIONAL FLOW
CH THERMISTOR
DHW THERMISTOR
DHW
FLOW
SENSOR
MODULATING
VALVE
LOW VOLTAGE
FUNCTIONAL FLOW
25
TERMINAL
BLOCK
L
brown
brown
X3
brown
F1
TRANSFORMER
2AT
240/24V
red
X3
red
X3
PUMP
brown
X4
blue
OVERHEAT
X4
CUTOFF
red
X2
purple
FAN SPEED
X2
RESISTOR
yellow
X2
brown
X2
blue
X2
N/O
red
X2
C
grey
X2
violet N/C
X2
N/O4
grey
C1
white
black N/C2
blue
N
X3
orange
24v~
orange
orange
orange
purple
purple
black
white
red
grey
grey
ON/OFF
SWITCH
24V
LOW
VOLTAGE
red
GAS
VALVE
brown
FAN
AIR
PRESSURE
SWITCH
LOW WATER
PRESSURE
SWITCH
X1
X1
3.15AT
X6
X6
X6
X6
X5a
X5a
X5a
X5a
X5a
Diagram 13.2
221679H