2. Clean the pipes inside the heat exchanger using diluted white vinegar
and a nylon brush.
3. Flush with water.
Important
The water will exit the heat exchanger by passing through the
condensates discharge siphon.
4. After twenty minutes, wash off any dirt with a powerful water jet.
Caution
Do not use a high-pressure cleaner.
Be careful not to direct the water jet straight at the insulating
surface behind the heat exchanger. If the insulating surface is wet,
it must be changed.
5. Check the burner.
6. Clean the siphon.
7. Remount the burner.
For more information, see
Remounting the burner, page 107
11.2.4 Checking the burner
1. Remove the burner.
2. Check whether the surface of the burner is damaged in any way.
Replace the burner and its gasket if they are damaged.
3. Check the safety thermostats.
Important
Replace the safety thermostats if they are damaged.
4. Clean the burner with a vacuum cleaner.
Important
Do not use a brush as it may damage the burner.
5. Check the L1 distance between the flame detection electrode and the
burner.
Tab.78 Flame detection electrode and burner
Boiler
L1 distance
IX 145–50
IX 145–70
IX 145–90
7.5 mm / tolerance of +/- 1 mm
IX 145–110
5 mm / tolerance of +/- 1 mm
Important
Replace the flame detection electrode if it is damaged.
Fig.120
MW
-3
0
0
0
1
0
0
2
3
Fig.121
MW
-3
0
0
0
1
0
1
-0
2
4
Fig.122
MW
-3
0
0
0
1
0
2
L1
11 Maintenance
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