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Supplied By www.heating spares.co Tel. 0161 620 6677
22
LED 1 shows 2
LED 2 shows
0
1
2
3
4
5
6
7
8
9
Reason
Standby
Purge
Ignition
Heat request
N/A
Fan-speed low
Built-in delay
Pump over-run
N/A
High temperature
LED 1 shows 3
LED 2 shows
°
C Temperature of flow sensor at time
of lockout
LED 1 shows 4
LED 2 shows
°
C
Temperature of return sensor at
time of lockout
Press the RESET button to exit the appliance
engineer mode.
7.8
TEMPERATURE SENSOR VIEWING MODE
The current temperature of the two temperature
sensors can be viewed individually via the LED
display, in addition the set-point of the flow or
return sensor can also be viewed (depending on
mode of operation).
To access the viewing mode:
●
press the MODE button until a flashing decimal
point is displayed in LED 1.
●
press the STEP button to display the relevant
information in LED 2 (see below).
7.9
CHECKING THE EXPANSION VESSEL
Carry out the component removal procedure as
described in 6.4. You must ensure that the boiler
is completely drained of water.
Using a suitable pressure gauge, remove dust
cap on expansion vessel and check the charge
pressure. The correct charge pressure should be
1.0 bar
±
0.1 bar. If the charge pressure is less,
use a suitable pump to increase the charge.
Please note, you must ensure the safety valve is
in the open position whilst re-charging takes
place. Replace the dust cap and carry out the
relevant commissioning procedure.
LED 1 SHOWS
1
2
3
4
5
6
7
8
9
LED 2 SHOWS
Flow sensor temperature
Return sensor temperature
N/A
N/A
N/A
Set-point (dependant on mode)
Temperature rise per second
Return rise per 8 seconds
7.10
EXTERNAL FAULTS
Before carrying out any fault-finding or component
replacement, ensure the fault is not attributable to
any aspect of the installation.
For example external wiring fault, service valves
closed, gas supply turned off, etc. The table
below may assist in identifying some common
installation faults.
7.11
ELECTRICAL CHECKS
Any electrical checks must be carried out by a
suitably qualified person.
7.11.1 EARTH CONTINUITY TEST
Isolate the appliance from the electrical supply,
and using a suitable multi-meter carry out a
resistance test. Connect test leads between an
appliance earth point and the earth wire of the
appliance supply cable. The resistance should
be less than 1 ohm. If the resistance is greater
than 1 ohm check all earth wires and connectors
for continuity and integrity.
7.11.2 SHORT CIRCUIT CHECK
Isolate the appliance from the electrical supply,
and using a suitable multi-meter, carry out a short
circuit test between the Live & Neutral connections
at the appliance input board (see fig.15).
Repeat above test on the Live & Earth connections
at the appliance input board (see fig.15).
NOTE
Should it be found that a fuse has failed but no
fault is indicated, a detailed continuity.
Check will be required to trace the fault. A visual
inspection of components may also assist in
locating the fault.
7.11.3 POLARITY CHECK
With the appliance connected to the electrical
supply and using a suitable Multi-meter, carry out
the following voltage tests:
●
connect test leads between the Live & Neutral
connections at the appliance input board (see
fig.15). The meter should read approximately
230V ac. If so proceed to next stage. If not, see
7.11.4.
●
connect test leads between the Live & Earth
connections at the appliance input board (see
fig.15). The meter should read approximately
230V ac. If so proceed to next stage. If not, see
7.11.4.
Fault code Displayed
202
918
436
437
Possible cause
Gas turned off
Air in gas pipe
Insufficient gas
Pump seized
Flow/return service valve
closed
Flow sensor cable
disconnected
Return sensor cable
disconnected