Changing Components - Potterton iHE 100 Installation & Servicing Instructions Manual

4.2 CHANGING COMPONENTS

NONE OF THE CONTROLS ARE REPAIRABLE . IF THEY
ARE NOT FUNCTIONING THEY MUST BE REPLACED
In all cases, before work commences turn off the
mains electricity and gas supply.
The following items can be replaced:
• Pressure and temperature relief valves.
• Flow, return and DHW Flow sensors
• LLH and tank sensor.
• Flue sensor.
• The HMI display.
• Master and slave PCBs
• Spark generator.
• Spark and sense electrodes.
• Gas valve.
• Fan.
• Venturi.
• Heat exchanger.
• Pumps.
• Plate heat exchanger.
P T R
RESSURE EMPERATURE
The removal of this valve will require either the drain-
ing or the valving off of the system that is above tank
level. Once Isolated the connecting pipework can be
removed and the valve unscrewed from the tank.
R , F DHW F
ETURN LOW AND
The Flow and return sensors are clipped on to the
copper pipework beneath the heat exchangers. The
DHW Flow sensor is clipped to the DHW Flow pipe on
the left side of tank.
• Pull off the two leads and unclip the sensor
• Replacement is the reverse.
L L H DHW T
OW OSS EADER AND
The LLH sensor is fi tted into the top of the LLH in
the rear top left hand side of the appliance.
• Undo the securing screw and withdraw sensor
from pocket.
• Unplug connector from loom
• Cut off securing tie and remove senor
• Replacement is the reverse.
The DHW tank sensor is located in a pocket behind
the right hand appliance door.
• Remove the securing slide and withdraw sen-
sor from pocket.
• Unplug connector from loom and remove sensor
• Replacement is the reverse.
F S
LUE ENSOR
This is located at the Flue outlet of the heat ex-
changer.
• They are removed by turning anti-clockwise a
quarter turn and withdrawing.
• Replacement is the reverse.
iHE
V
ELIEF ALVE
S
LOW ENSORS
S
ANK ENSORS
AVS 37 HMI D
ISPLAY
• Use a small fl at edged screwdriver to release the
HMI from its mounting bracket, by springing off its
four plastic edge clips.
• Remove the cable from the HMI Display.
• Replacement is reverse.
LMS14 PCB 1 3
TO
These are located on control panel. It is important that
the correct PCB replacement is used in the right place.
They are named from top to bottom
PCB1, PCB2 and PCB3.
• Carefully pull off all the connectors on the PCB.
• Release in turn, all 7 PCB supports by squeezing
together the end of the support and withdrawing
the board from each support.
• Replacement is the reverse.
S G
PARK ENERATOR
This is located at the front of the heat exchanger on
the fan mounting bracket.
• Carefully pull off the grey connector to the genera-
tor.
• Release the nut holding the generator to the
bracket, and remove generator.
• Replacement is the reverse.
S S E
PARK AND ENSE LECTRODES
These are located on the front of the heat exchanger.
• Carefully pull off the electrical connectors.
• Undo the two screws retaining the bracket and
withdraw.
• Replacement is the reverse ensuring that the gas-
ket seal is place correctly and is in good condition.
P H E
LATE EAT XCHANGER
• Remove the lower left hand side cover to gain ac-
cess to the heat exchanger
• Remove the condense pipework from behind the
heat exchanger.
• Remove the two crosshead screws, located either
side of the heat exchanger.
• Drain as much of the primary and secondary sys-
tems water as possible, to reduce water spillage.
• Release all four heat exchanger connections and
slide the heat exchanger toward the rear of the
appliance
• Replacement is the reverse.
35 GB/IE