Procuring Spare Parts; Removing The Compact Thermal Module; Cleaning The Heat Exchanger - Vaillant ecoTEC plus VU GB 656/4-5 A Installation And Maintenance Instructions Manual

8 Inspection and maintenance
8.2

Procuring spare parts

The original components of the product were also certified
by the manufacturer as part of the declaration of conformity.
If you use other, non-certified or unauthorised parts during
maintenance or repair work, this may void the conformity of
the product and it will therefore no longer comply with the
applicable standards.
We strongly recommend that you use original spare parts
from the manufacturer as this guarantees fault-free and safe
operation of the product. To receive information about the
available original spare parts, contact the contact address
provided on the reverse of these instructions.
▶
If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
8.3

Removing the compact thermal module

Danger!
Risk of death and risk of material damage
caused by hot flue gas.
The seal, burner insulation and self-locking
nuts on the burner flange must not be dam-
aged. Otherwise, hot flue gases may escape
and cause personal injury and material dam-
age.
▶
Replace the seal each time you open the
burner flange.
▶
Replace the self-locking nuts on the
burner flange each time you open the
burner flange.
▶
If the burner insulation on the heat ex-
changer's burner flange shows signs of
damage, replace the burner insulation.
▶
Replace the burner insulation on the back
wall after each time the burner flange is
opened.
Note
The compact thermal module consists of four
main components:
– Speed-regulated fan,
– Gas-air mixture fitting,
– Gas supply (mixture pipe) to the premix burner,
– Premix burner.
1. Use the main switch to switch off the product.
2. Close the gas isolator cock.
3. Remove the front casing. (→ Page 10)
4. Tilt the electronics box forward.
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5. Unscrew the retaining screw (3).
6. Tilt the air intake pipe (2) forwards.
7. Remove the air intake pipe from the intake manifold.
8. Remove the ignition line and ground connection plugs
from the ignition electrode (5).
9. Disconnect the gas line (9) from the underside of the
gas valve.
10. Pull out the cable (7) from the fan motor, the PWM
signal cable from the underside of the fan (8) and the
cable to the gas valve (10).
11. Unscrew the six nuts (4).
12. Remove the entire compact thermal module (6) from
the heat exchanger (1).
13. Check the burner and the heat exchanger for damage
and dirt.
14. If necessary, clean or replace the components accord-
ing to the following sections.
15. Replace the burner insulation on the back wall of the
heat exchanger.
16. Check the burner insulation on the burner flange. If
you notice any signs of damage, replace the burner
insulation.
8.4

Cleaning the heat exchanger

1. Protect the folded down electronics box against sprayed
water.
Installation and maintenance instructions ecoTEC plus 0020214491_01
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