Baxi ECOGEN 24/1.0, Installation & Servicing Instructions Manual

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13.3 Servicing ­ Internal Integrity
Safety Note: Before removing the front cover; the correct shut down sequence must be followed for your own safety.
Before servicing, ensure that the boiler is cool with the engine head below 120°C ­ otherwise there is a risk of
electric shock even with the supplies disconnected.
The head temperature may be accessed via the THINK Controller.
Press the MENU Button. Turn the Selector Button to highlight 'Information'.
Press the Button to select. Turn Selector Button until 'head temp actual value' is shown.
Ensure that both the gas and electrical supplies to the appliance are isolated ­ wait a minimum of 6 minutes 30 seconds
before any work is started ­ again there is a risk of electric shock even with the supplies disconnected.
NOTE: Before undertaking any service work that entails the removal and replacement of parts, ensure that the center
transit bracket is refitted to protect the engine head (see
Fig.48 ).
This bracket must then be removed before running the engine.
1. Remove the plastic facia on the front of the appliance which is held on by two magnets ( Fig. 51 ).
2. Remove the two screws and the front case by pulling forward at the bottom edge and then lifting clear of the engagement at the top of the appliance ( Fig. 51 ).
3. Undo the four screws from the bottom cover and remove the cover ( Fig. 51 ).
4. Remove the two screws on the front of the control tray to gain access to the control tray area ( Fig. 52 ).
5. Inspect the unit for any signs of water damage and rectify any leaks.
6. Generally check the conditions of the wiring of the appliance and the external wiring for and loose/ poor connections and remake if necessary.
7. Inspect the condition of the condense trap for signs of debris and possible blockage. If necessary remove the service plug, drain and clean the compartment. Replace the
plug, reassemble the case and check for correct operation when the appliance is running.
8. Check and clean the magnetic filter if it is of the serviceable type, otherwise replace the cartridge. If it observed that there is excessive amounts of corrosion product ­
black residue/sludge check the inhibitor level in the system and top up with inhibitor solution as required.
Fig. 51 & Fig. 52
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13.4 Servicing ­ Combustion and Rate Checks
1. Perform combustion and rate checks by using the chimney sweep mode to force each burner into maximum rate (see section 15.0 Combustion Checks). Combustion
reading of CO2 ~ 8.7 ­ 9.3 and CO less than 100 ppm are acceptable for both burners. Measure the CO/CO2 ratio. This valve must be less than 0.004.
2. Set each burner separately to a minimum and check that the burner stays lit with clean combustion.
3. If there is a problem with the rate or combustion see
Section 15.2 .
4. If there is a problem with the ignition, the following servicing should be carried out.
See SAFETY NOTE Section 13.3 Engine Ignition and Flame Sensing Electrodes ( Fig. 53 )
1. Detach the ignition and flame sense leads from the wiring harness noting their positions.
2. Undo the long nuts (7mm spanner) retaining the engine ignition and flame sense electrodes.
3. Carefully withdraw the electrodes from the engine.