4. Clean the CH return filter and then, return it.
Do not forget to close the drain point.
Make sure that there is no damage/foreign
substance on a O-ring.
Keep the boiler clean at all times.
Leakage of exhaust gases could lead to carbon monoxide poisoning.
1. Unplug the boiler. Wait for 20 minutes.
When the CH return filter is blocked, [
]
Blinks on the display.
2. Close the water supply valve and then,
pull the pressure relief valve out. Drain the
water inside of the boiler (About 5L).
Be careful since the water could be hot.
3. Turn the handle of the CH return filter to the
left and then, remove it by using a coin.
Be careful since the remaining water could
be hot.
If the CH return filter and / DHW inlet filter is blocked by foreign substances, it could deteriorate
the performance of the boiler as well as its service life.
Clean the filters regularly in compliance with the following instruction.
After cleaning and/or maintenance, check to
ensure that all the components of the boiler
are intact.
Unplug the boiler prior to cleaning and/or
maintenance.
Do not wipe the boiler and remote controllers
with a wet cloth.
Risk of an electric shock or malfunction.
Do not use a brush or a polish on the boiler.
It could result in discoloration or peeling.
Cleaning & Maintenance
Cleaning the CH return Filter
17
pressure
relief valve
CH return filter
COIN
5. Connect the power supply and then, open the water supply valve and turn on the boiler by
pressing the CH mode button( ) or DHW mode button( ).
Summary of Contents for R331
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