Morco EUP11 - 4. MAINTENANCE; 4.b Troubleshooting: Problems and solutions

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4. MAINTENANCE
To maintain the machine at maximum efficiency, have Gas Safe
Engineer or other qualified personnel perform a maintenance
check at least once a year.
Before cleaning or performing maintenance, opening or
disassembling the panels, switch off the device and turn off the gas
supply. Check the main burner and the pilot flame, the ignition
electrode, the safety valve and that there is no gas or water
leakage. Check that there is nothing obstructing the passages
within the heat exchanger or flue.
To clean the outside of the panels utilize a cloth with soap and
water. Do not use solvents, powders or abrasive sponges.
Do not clean the device and/or its parts with flammable materials
(e.g. petrol, alcohol, diesel etc.).
4.a Removing the casing
To remove the outer casing follow the steps below:
- Remove the selector knobs (A and B)
- Remove the screws (C)
- Shift the casing upwards to free it from the upper and lateral hooks
- Shift the casing forwards
- To reinsert the casing, follow the above steps in reverse order.
4.b Troubleshooting: problems and solutions
For the best functioning of the water heater, to prolong its lifetime
and ensure that it is always safe, it should be inspected at least once
a year by a gas safe engineer. The gas safe engineer is to perform
the following maintenance operations:
- Remove any rust from the burner
- Remove any deposit from the electrodes
- Clean the combustion chamber
- Check the ignition, switching off and general functionality of the
appliance
- Check that the gas and water pipes and connections are sealed
Warning: the following repair instructions are only to be performed
by Gas Safe Engineers or other qualified personnel.
PROBLEM CAUSE SOLUTIONS
There is no spark - appliance spark wire is disconnected - reconnect
- piezoelectric mechanism broken
- the electrode is damaged
- test, replace
- replace
The pilot does not switch on when
there is a spark
- pilot injector blocked - clean by immersing in solvent or replace
- electrode activation position needs
changing
- adjust
- no gas supply - open the appliance gas isolation valve
- air in the gas tubes - purge air by turning on all gas rings on hob
for 30 seconds
The pilot does not stay on - thermocouple faulty - replace
- broken magnetic valve - replace
Pilot on but the main burner does not
ignite
- insufficient water pressure
- Increase the external water supply
pressure
- rotate the knob B counter clockwise
- the diaphragm is broken - replace
The burner does not switch off when
the water turns off
- contamination on the gas valve seat - test, clean
- gas valve push rod is locked in the open
position
- Check the correct operation of the cold
water push rod , dis-assemble, clean or
replace
- check the gas pressure - if the inlet gas pressure exceeds the
specification replace the pressure
regulator on the external bottle or tank
Delayed burner activation - pilot burner flame is too far from main
burner flame or it is too short
- check inlet gas pressure, clean injector and
pilot burner
The heat exchanger fins becomes
sooty in a small amount of time
- poor draught, adverse weather conditions
or dusty surroundings
- check the flue installation
- yellow flame - check the gas type and clean the burner
- excess gas consumption - check gas pressure and adjust
fig. 7