Fault Fi Nding; Heating - Potterton iHE 100 Installation & Servicing Instructions Manual

3.6 FAULT FINDING
O S
PERATION EQUENCE
To operate this appliance you must have a mains
gas supply, 230v 50Hz electricity supply and a
valid demand from either the DHW or the space
heating system
If all the above are correct then the Gas Ignition
Control starts the Ignition sequence:
1. The Fan operates on one heat engine as a
pre-purge of the heat exchanger
2. After a 20 seconds a spark is created at the
electrode and the gas valve is opened.
3. The burner should light within 5 seconds.
4. The burner fl ame is sensed and the spark is
5. The fan speed is then changed by the
control to suit the working conditions.
6. If the burner fails to ignite after 5 seconds
the spark will stop and the fan will run on as
a post-purge of the heat exchanger.
7. The ignition sequence will be repeated up to
four more times, then the control will lockout
and will require a manual reset to start again.
L
OCKOUTS
If the heat engine is unable to ignite or detects
a safety condition, the control will lockout and
that heat engine will stop fi ring. The display will
show the symbol and the green LED on the
appropriate LMS14 control PCB will fl ash. The
fault will have to be cleared before that heat
engine will function. Pressing the Info button
will provide the fault detail (see Table 2.0 for the
most common lockouts). Press the RESET button
and provided the condition has been corrected
the heat engine will run through the ignition
sequence again.
10 Outside Sensor error (where fi tted)
20 Flow Sensor error.
28 Flue Gas Temperature Sensor error.
30 Flow Sensor error
40 Return Sensor error
50 DHW Temperature Sensor error
128 Loss of Flame during operation
133 Unsuccessful Ignition
A Lockout condition should not be
repeatedly reset. If the condition
persists then a qualifi ed repair
engineer should be called.
iHE
removed.
Table 2.0
L D
(Table 2.0)
OCKOUT ISPLAY
The display will show a
More information can be obtained by pressing the Info
button on the HMI display screen. Example screen:
Error
30:Flow sensor 1
The number on the display indicates the number of the
PCB that the fault has occurred on (See fi g 7.1 for help in
identifying PCB). In this example a fl ow sensor error has
occurred on the second heat engine (PCB 2).
D
IAGNOSTICS
The HMI can provide additional information in engineer mode.
To enter engineer mode:
• Press OK then hold down the Info button for more than 3
seconds.
• Select engineer from the list using the wheel, then press
OK.
• Use the wheel to scroll down to 'Fault' and press OK.
• Step through the lines 6800 to 6995 to list the last 20
faults. The fi rst screen gives the general fault and the
time and date of its occurrence. Example screen:
•
Fault
History 1
133: Safety Time Exceeded
• Page two of fault history records specifi c details about
what the software and controls were doing at the precise
moment the fault occurred. Example screen:
Fault
SW diagnostic code 1
Burner control phase 1
A complete listing of displayed fault codes, and possi-
ble areas of resolution is given in table 3.0 on page 42.
Please also refer to the "iHE users operating and pro-
gramming guide" for details not covered by this manual.
33
if the appliance has locked out.
INFO
00:02
Prog
6800
No
09:32
26.01.2012
Prog
6805
No
625
3
GB/IE