Installation and Operation manual ETHOS 36C and ETHOS 54C –1511/05-issue1
Page 29
7.3 Maintenance
Depending on the inspection results, maintenance or preventive maintenance must be performed.
Reasons for maintenance are:
ad. a Comments or complaints from the client about the operation of the central-heating boiler can reveal possible
hidden defects or problems.
ad. b The installation pressure must be between 1 and 2 bar: locate possible leaks in the installation which must be
repaired by an installer or service department.
ad. c Possible leaks must be repaired.
ad. d In case of water leaks in the air supply pipe, locate the cause of the leaks, possibly in the roof plane or a
concentric pipe due to leaks in the flue pipe.
ad. e If the condensation in the siphon is very dirty, flush the siphon.
If the burner is already removed, use a filling hose to fill the heat exchanger with water. This water will
automatically reach the siphon.
ad. f If necessary, change the gas adjustment for min. and max. input at the gas valve.
ad. g If the central heating pump is too noisy, it is advisable to replace it as a precaution.
ad. h When the DHW flow is too low, check if the water restrictor is dirty(Only Ethos 36C). If it is clean and the
water flow is lower than the value from par 2.3 Technical data, de-scale or replace the DHW heat exchanger. In
99% of all cases, this problem is caused by scale in the sanitary fittings of the heat exchanger.
ad. i If the supply water temperature increases during tapping, the three-way valve is dirty on the inside and must be
cleaned or replaced.
ad. j Never clean the burner itself. If the heat exchanger is dirty on the inside and/or scale has built-up inside the
stainless steel pipes, scale can be removed by using a hard nylon brush or citric acid (never use a wire brush!).
Then remove the dirt with a vacuum cleaner.
ad. k If the fan blades are dirty, each blade must be cleaned carefully, until the blade material is visible again. If they
are cleaned unevenly, the fan will rotate irregularly and get out of balance.
ad. l Bend the electrode carefully, without touching the burner, until the correct distance is obtained (see figure
below).
10 / 12 mm
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