The Propex Malaga 3 and 3E water heaters are equipped with a self diagnostic
fault finding system. The system operates by flashing the red LED on the Malaga
switch panel a certain amount of times to indicate what the fault is. The light will
continue to flash while the switch is turned on. Some of the fault codes indicate
electronic faults in different parts of the printed circuit board, in which case the
frequency of the flashing light will only be useful to someone trying to repair the
circuit board.
2, 3, 4 & 5 flashes PCB Fault Replace MHC251 PCB
6 flashes Flame out Check gas supply
7 & 8 flashes Micro-processor Replace Micro-processor
CONNECTING THE WATER HEATER
1. WATER: The Malaga 3 is fitted as standard with John Guest Speed-fit stems
which take 12mm speed-fit pipe. Alternatively you can also use half reinforced,
food quality, opaque or equivalent pipe. It is important that the hot and cold
connections are connected correctly and if the plastic inlet connection is
removed, only a plastic replacement should be used.
IMPORTANT: The hot water outlet connection at the top of the tank must not
be removed as this houses an additional internal tube which provides the air
space for expansion inside the tank. The water pressure must not exceed 1.3 bar.
ALSO do not connect this appliance to a mains water supply.
Drain/Pressure Relief Valve – Drill the appropriate sized hole in the floor
close to the heater and run a piece of hose from the drain port, through the hole
to the outside. Seal round the hole with silicone or similar sealant.
Water Systems – The heater will work satisfactorily on either system where the
pump is controlled by a tap, micro-switch or pressure switch.
2. GAS: The gas fitting is 8mm (5/16”) and a suitable compression fitting is
required. An isolation tap should be fitted near to the heater and any
unsupported pipe-work secured. It is recommended that a gas drop hole be
positioned near to the heater and that all connections are carried out by a corgi
registered person.
3. ELECTRICITY: Fit the switch panel in the chosen position and route the 4
core loom down to the heater and plug into the PCB. Connect the 2 core loom to
the 12v supply and route to the heater making sure the polarity is correct.
Malaga 3E only – The 3 core mains cable should be connected to a 230v AV –
5 amp fused spur.
Note: This appliance must be earthed.
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FAULT FINDING – CHECK LIST
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DETAILED FAULT FINDING
1. HEATER NOT WORKING – L.E.D. DOES NOT LIGHT UP.
Check red button in middle of overheat thermostat and 1amp anti-surge fuse on
circuit board. If none of these, check continuity across thermostats and wiring
connections including the terminal housings that plug onto the PCB.
2. L.E.D. COMES ON BUT THE HEATER DOES NOT LIGHT.
After 10 seconds, you should be able to hear the gas solenoid valve open, and the
ignitor start sparking. If no valve, wait for the 2 ignition cycles to complete and
count the number of times the red L.E.D. flashes. If it flashes 2,3,4 or 5 times
it indicates a fault on the PCB. If 6 flashes are observed, disconnect valve from
PCB and apply 12V, if it does not work get it replaced. If there is no spark, this
can be either a PCB fault or a faulty HT lead between the ignitor and ignition
electrode. If the solenoid opens, and the ignitor is sparking correctly there has to
be a gas supply problem which could be a blocked jet, blocked pipe or faulty
regulator.
3. HEATER LIGHTS BUT GOES OUT AFTER 5 SECONDS.
This condition will also end up with a 6 flash fault code and is due to the flame
signal not getting to or not being recognized by the electronics. Firstly, make sure
the left hand PCB mounting screw is connecting the board securely to the tank.
Check the HT lead to make sure the terminal is not broken, or that the lead itself is
not damaged. The other causes could be that the electrode is not fully in the flame,
the flue terminal is incorrectly fitted, or that there is an electronic fault on the
PCB.
BEFORE UNDERTAKING ANY OF THE TESTS BELOW CHECK GAS
PRESSURE, 12V DC SUPPLY, 230V SUPPLY (MALAGA E) AND
THAT THERE IS A STEADY SUPPLY OF WATER AT THE HOT TAPS.
