Glow-worm SwiftFlow 120 Servicing Instructions page 7

3.1 Initial Checks
If the boiler fails to operate, first check the following:
1. That the electrical supply is available at the boiler and
the fuses are in order.
NOTE: THE BOILER CONTROL BOARDS CAN BE
DAMAGED BY INCORRECT TESTING WITH THE
POWER ON.
2. Make sure that the system pressure gauge registers
0.7bar, minimum and that the automatic air vent works.
Refer to Installation Instructions, Section 11.2.
3. That the gas supply is available at the boiler and
purged of air.
4. Is the pilot burner lit? - If the pilot burner will not
light refer to Section 3.2. If the pilot burner fails to
remain alight, refer to Section 3.3
5. That the boiler is set for the required service.
6. With the boiler central heating selector switched
"Off", see diagram 3.2 check that the domestic water
supply is available and water flows freely from the hot
taps. Close the taps.
7. With the boiler central heating selector switched
"ON", see diagram 3.2, check that all heating system
controls, if fitted, are working correctly and calling for
heat. If not isolate the boiler from the electrical supply.
Disconnect the rear multi-pole connector at the base of
the boiler and release the cable from the clamp.
Remove the connector cover and dependent on the type
of control fitted test for continuity, mains or low voltage
at terminals 1 and 2, see diagram 3.1.
If this is satisfactory continue with the detailed
fault finding.
Supplied By www.heating spares.co Tel. 0161 620 6677
3 F a u l t F i n d i n g
E
N
L
3
CABLE
CLAMP/COVER
SCREW (2)
SWITCH
(OFF)
C.Htg.
SELECTOR
SWITCH
PRESSURE
GAUGE
Orange Light
'MAINS'
Green Light
'RUNNING'
7
CABLE TO
REMOTE
HEATING
CONTROLS
1
2
MAINS
CABLE
Diagram 3.1
PIEZO BUTTON
GAS CONTROL KNOB
CLOCK/TIMER
(IF FITTED)
SWITCH
(ON)
Red Light
LOW C.Htg.
WATER
PRESSURE
CABLE
CLAMP
Diagram 3.2
221045A