Main Combi 24 HE Manuel de service télécharger pdf (Page 46)

16.0 Fault Finding

NOTE: When instructed to turn the

selector to the reset position turn the

selector switch fully anticlockwise against

the spring pressure to the reset position

and hold for 5 seconds to reset the

boiler.

16.1 Initial Fault Finding Checks

1. Check that gas, water and electrical supplies are available

at the boiler.

2. Electrical supply = 230V ~ 50 Hz.

3. CH water system pressurised to 0.5 bar minimum when

the boiler is cold.

4. The preferred minimum gas pressure is 20 mbar.

5. Carry out electrical system checks, i.e. Earth Continuity,

Resistance to Earth, Short Circuit and Polarity with a suitable

meter.

NOTE: These checks must be repeated after any

servicing or fault finding.

6. Ensure all external controls are calling for heat and check

all external and internal fuses. Before any servicing or

replacement of parts, ensure the gas and electrical supplies

are isolated.

16.2 Error Codes

1. If a fault occurs on the boiler an error code may be shown

by the facia display.

2. The codes are either two or three digit, preceded by the

letter 'E'. For example, code E133 will be displayed by 'E1'

alternating with '33'. E50 is shown as 'E' then '50'

E20, E28 & E50 indicate faulty components.

E110 shows overheat of the primary water and E130

overheat of the flue system.

E119 is displayed when the primary water pressure is less

than 0.5 bar.

E133 indicates that the gas supply has been interrupted,

ignition has failed or the flame has not been detected.

E125 is displayed in either of two situations:-

i) If within 15 seconds of the burner lighting the boiler

temperature has not changed by 1°.

ii) If within 10 minutes of the burner lighting the boiler

temperature twice exceeds the selected temperature by 30°.

In these instances the pump is probably inoperative.

3. By turning the selector switch to the 'Reset' position for a

minimum of 5 seconds when E110, E130 & E133 are

displayed it is possible to relight the boiler.

4. If this does not have any effect, or the codes are displayed

regularly further investigation is required.

Central Heating NTC Fault

Flue NTC Fault

Hot Water NTC Fault

Safety Thermostat Operated

Water Pressure Switch Not Operated

Pump Fault

Flue NTC Operated

Interruption Of Gas Supply or Flame Failure

Fan or Fan Wiring Fault

E20

E50

E28

E110

E119

E125

E130

E133

E160

Table Of Error Codes

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 55 56

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Main Combi 24 HE Manuel de service Page 46

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