Fault Fi Nding; Heating - Potterton iHE 100/300 Installation And Servicing Instructions

FAULT FINDING
O S
PERATION EQUENCE
The appliance requires Mains on both the Live (L)
and Remote Enable connection to be able to run. It
is delivered with a link between them which can be
removed if a Timer or Remote Switch is used.
To run the Heater you must have a Mains supply,
Gas, and a Tank or Central Heating temperature
below their set point.
If all the above are correct then the Gas Ignition
Control starts the Ignition sequence:
1. The Fan runs as a pre-purge of the Heat
Exchanger
2. After a few seconds a spark is created at the
electrode and the burner is lit.
3. The burner fl ame is sensed and the spark is
removed.
4. The Fan speed is then changed by the control
to suit the working conditions.
5. If it fails to light the burner the spark will stop
and the Fan will run on as a post-purge of the
Heat Exchanger.
6. The ignition sequence will be repeated up to fi ve
times, then the control will lockout and will require
a manual reset to start again.
L
OCKOUTS
If the Heat Engine is unable to light 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 Control Board 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 the Table 2.0 for the most common
lockouts. Press the RESET button and provided
the condition has been corrected the Heat Engine
will try to light.
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 engi-
neer should be called.
iHE
L
OCKOUT
The Display will show a
out. More information can be obtained by pressing the Info
button on the HMI display screen. Example screen:
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:
•
•
•
•
•
•
Table 2.0
A complete listing of displayed fault codes, and pos-
sible areas of resolution is given in table 3.0 on page
34. Please also refer to the "iHE users operating and
programming guide" for details not covered by this
manual.
D
(Table 2.0)
ISPLAY
INFO
Error
30:Flow sensor 1
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 pre-
cise moment the fault occurred. Example screen:
Fault
SW diagnostic code 1
Burner control phase 1
26
if the appliance has locked
00:02
Prog
6800
No
09:32
26.01.2012
Prog
6805
No
625
3