Glow-worm Betacom C - Manual (Page 51)

51
F1
F2
br
230V
TEST
POSITION
br
br
b
b
b
b
g/y
g/y
bk
m
w
r
13 Fault finding
13.1 Preliminary fault finding
The following checks should be performed before proceeding
onto specific diagnostics:
Check the external electrical supply to the boiler is on and a
supply of 230V is present at the ‘L’ and ‘N’ terminals.
Check the electrical installation and boiler, carry out tests for
earth continuity, polarity, short circuit and resistance to earth,
using a suitable multimeter.
An aid to test
Remove the front casing panel, see diagram 10.1 and hinge
down the control box.
Unclip to gain access to the mains circuit board, see diagram
10.4.
Carry out the tests on the mains circuit board, see diagram
13.1.
Check chassis earth at a bare metal point on the boiler.
Check that there is a gas supply to the boiler and the gas
service isolation valve is turned on, see diagram 13.2.
Check pressure at the gas service isolation valve, refer to
section 11.5.
Check that the heating system pressure indicates at least
1.0 mbar, if not, fill and vent the system as described in
section 11.2.
Check that all external controls are on.
13.2 Re-set function
Should the boiler lock out at any time, please check the
gas supply and ionisation probe position, the boiler may be
re-started by switching to standby “O” position waiting 15-30
seconds and switching back to its previous position once the
fault has been eliminated, see diagram 11.4.
14520
Diagram 13.3
Diagram 13.2
Diagram 13.1
ON
bar
Boiler Stand-by
Indicator
Water
Temperature
Flashing
Fault on CH
sensor
Flashing
Fault on
Outdoor sensor
Flashing
Fault on Air
Pressure Switch
Flashing
Flames or Gas
Failure
Flashing
Fault on
DHW sensor
Flashing
Low System
Pressure
Flashing
Overheat
Themostat
30 40 50 60 70 80 90
bar
14571
14637
GAS SERVICE ISOLATION
VALVE (OPEN)