13 Troubleshooting
38 Installation and maintenance instructions MicraCom 0020289288_02
– Take all necessary precautions to ensure that it
cannot be switched back on again.
3. Disconnect the product from the mains power.
4. Close the service valves of the product.
5. Remove the front casing. (→ Page 22)
6. Hinge the electronics box downwards.
7. Protect the electrical components (e.g. the electronics
box) from spraying water.
8. Use only new seals.
13.4.3 Replacing the gas valve assembly
Note
Each destroyed tamper-proof seal must be re-
placed with a new tamper-proof seal.
1. Remove the gas valve assembly as shown in the figure.
2. Install the new gas valve assembly in reverse order.
3. Attach the two screws to the gas valve assembly.
– Tightening torque: 2 Nm, if a torque spanner is
available
4. When restarting the product, carry out a leak-tightness
test, check the CO₂ content and, if required, adjust this.
13.4.4 Replacing the fan
1. Move the expansion vessel to the maintenance position
on the combustion block. (→ Page 32)
2. Remove the compact thermal module. (→ Page 33)
3. Remove the fan as shown in the figure.
4. Reinstall the new fan in the reverse order.
5. Install the compact thermal module. (→ Page 34)
6. Reinstall the expansion vessel.
7. When restarting the product, check the CO₂ content
and, if required, adjust this.
13.4.5 Replacing the pump head
1. Remove the pump head as shown in the figure.
2. Install the new pump head in reverse order.
13.4.6 Completing repair work
1. Hinge the electronics box upwards.
2. Install the front casing. (→ Page 27)
3. Establish the power supply if this has not yet been
done.
4. Open all service valves and the gas stopcock if this has
not yet been done.
5. Switch the product back on if this has not yet been
done. (→ Page 25)
6. Check the product for tightness. (→ Page 29)
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