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4.- MAINTENANCE
Note: before carrying out any maintenance or repair operations, the heater MUST
be disconnected from the mains electric, and the gas and water supply.
MORCO recommends yearly inspection of the heater by a qualified and
competent service engineer.
The following inspections should be carried out:
• Check that the electrical installation is in good condition
• Check for soundness of the gas and water installations.
• Check for blockages and contamination of the flue assembly, especially
spiders webs and egg-sacks which can find their way along the flue and into
the venturi causing ‘LOCKOUT’.
• Check for correct gas pressure.
• Check that the burner and heat exchanger are free of soot and other
contamination.
Cleaning the burner
Remove the burner and clean the bars with a soft brush or compressed air. Do
not use chemical products.
Remove the ignition and ionisation spark electrodes and clean the ends.
The electrode unit should be replaced every three years.
Cleaning the heat exchanger
Clean the heat exchanger with hot water. If it is particularly dirty, leave it to soak
in hot soapy water.
Replace the heat exchanger seals when it is refitted.
Cleaning the cover
Clean the cover with a damp cloth. Do not use aggressive detergents.
Scale prevention
If the appliance is installed in a hard water area and if the following appear over time:
• a reduction in the hot water temperature, or
• a reduction in the hot water flow
this means that scale deposits have formed in the heat exchanger.
To reduce this effect, we recommend obtaining the desired working temperature
by using the gas power control and the temperature selector, rather than by
mixing cold water at the tap.
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