Troubleshooting - Vaillant ecoTEC plus 806 VU GB 806/5-5 Installation And Maintenance Instructions Manual

10 Troubleshooting

16. Install the ignition and monitoring electrodes. Use new
seals for this.
–
Torque: 2.8 Nm
17. Install the gas-air mixture unit. (→ Page 30)
18. Check that the product functions correctly and check
the leak-tightness (→ Page 24).
10.10.3 Replacing the insulating mat
If the safety cut-out on the burner door has been triggered,
the insulating mat between the burner door and burner room
may be damaged.
▶
Check and replace the insulating mat.
Note
To replace the insulating mat, proceed in the
same way as when removing the burner. It is
not necessary to remove the burner.
10.10.4 Replacing the fan
1. Remove the gas-air mixture unit. (→ Page 28)
2. Undo the four nuts (1) on the fan.
3. Install the new fan on the burner door in the same ori-
entation in which it was previously positioned.
Conditions: Applies for 80 kW and 100 kW
–
Torque: 3.5 Nm
Conditions: Applies for 120 kW
–
Torque: 6 Nm
Note
Tighten the screws on the fan evenly. The
fan must not be at an angle.
10.10.5 Replacing the heat exchanger
1. Drain the product. (→ Page 31)
2. Remove the gas-air mixture unit. (→ Page 28)
3. Unscrew the flow and return line in the front area of the
underside of the product.
34
4. Release the sealing collars on the flow and return pipe
from the floor plate.
1
1
5. Remove the screws (1) from the heat exchanger
bracket.
6. Lift the heat exchanger out of its bracket (this requires
two people). The pipes can be used as handles for this.
7. Install the new heat exchanger in reverse order.
8. Install the gas-air mixture unit. (→ Page 30)
9. Fill and purge the product and, if necessary, the heating
installation.
10.10.6 Replacing the PCB and/or the display
Installation and maintenance instructions ecoTEC plus 0020134823_04
Caution.
Risk of material damage caused by incor-
rect repairs.
Using an incorrect replacement display may
cause damage to the electronics.
▶
Before replacing, check that the correct
replacement display is available.
▶
Never use another replacement display.
Note
If you are replacing only one component, the set
parameters are transferred automatically. When
the product is switched on, the new component
adopts the previously set parameters from the
unreplaced component.