51
xtra
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Installation & Servicing
FAULT FINDING
FAUL
T FINDING FAUL
T FINDING FAUL
T FINDING FAUL
T FINDING FAUL
T FINDING FAUL
T FINDING
Before attempting any electrical fault finding ALWAYS carry out
the preliminary electrical system checks as detailed in the
Instructions for the British Gas Multimeter or other similar
commercially available meter.
The preliminary electrical system checks are the FIRST
electrical checks to be carried out during a fault finding
procedure.
On completion of any service/fault finding task which has
required the breaking and remaking of electrical connections
the following checks MUST be repeated:
a
Earth continuity
b
Polarity
c
Resistance to earth
Detailed instructions on the replacement of faulty components
are contained in the 'Servicing' section of these Installation &
Servicing Instructions.
Before carrying out Fault Finding ensure that all external controls
are calling for heat. There should be 230V ± 10% available at the
control box connection.
ALSO CHECK BOTH OT CENTERS ARE
CORRECTLY CONFIGURED (SEE FRAME 22)
.
The boiler control module has replaceable fuses protecting the
230V and 24V circuits. A common reason for the 230V fuse to
blow would be if the pump connected to the boiler was drawing
more than 1 amp.
If the 230V fuse has blown, the display will be blank. Check for
short circuits and pump loads before replacing the fuse.
OT CENTER FAULT FINDING
1. Top LED (Red)
Regular flashing indicates correct communication with OT Center
and electrical control module located to the right of the OT Center.
If regular flashing is not evident check:
a. Integrity of wiring between OT Center and electrical control
module.
b. Correct communication with electrical control module. (Refer to
Frame 42).
c. Correct fitment of Opentherm clip-in device. (Refer to Frame 66).
2. Middle LED (Yellow)
This indicates failure of boiler. If yellow LED is showing check fault
finding codes.
3. Bottom LED (Green)
Regular flashing indicates correct Center communication with OT
Center and connecting OT Center on adjoining module. If regular
flashing is not evident check correct fitment of both OT Centers and
adjoining communications lead. (Refer to Frame 23).
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