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2.0 Introduction
4
2.1 Introduction
1. Your Baxi Combi Instant 105e is a gas fired,
room sealed, powered flue combination boiler,
providing central heating for your home and mains
fed domestic hot water to taps and shower. It is
fully automatic and does not have a pilot light.
2. Priority is given to the hot water mode - when a
hot water tap is turned on the supply of heat to the
central heating circuit is interrupted.
2.2 Instant Domestic Hot Water
1. The boiler expansion vessel incorporates a
small volume of stored primary hot water.
2. When the boiler has been off and there is then a
demand for domestic hot water the stored primary
hot water ensures that domestic hot water is
supplied instantly at temperature.
3. The stored hot water is part of the primary
circuit. This is not supplied as domestic hot water,
which is fresh mains water heated by a heat
exchanger within the boiler.
4. The stored primary hot water temperature is
maintained whilst the boiler is in operation. During
a period when there is no demand for heating or
hot water the temperature of the stored primary hot
water will eventually fall. The boiler will operate
occasionally in order to maintain the temperature.
This is indicated by the domestic hot water mode
neon flashing (item 13 of Fig. 3).
2.3 Facia Panel
1. The facia panel is behind the hinged lower door.
As well as the on/off/reset selector switch, central
heating temperature control knob, pre-heat control
and pressure gauge, the facia incorporates ten
neon indicator lights.
2. Neons 12 to 15 indicate the operational status of
the boiler. Neons 6 to 11 have a dual function,
indicating the temperature of the central heating
water when constantly illuminated. If a fault
develops the appropriate neon will begin to flash.
Refer to Sections 3.3 to 3.7.
30° 40° 50° 60° 70° 80°
2
1
0
4
3
bar
OFF
ON
PREHEAT
Fig. 3
30° 40° 50° 60° 70° 80°
1. On/Off/Reset Selector Switch
2. Central Heating Temperature Control
3. Pre-Heat Control
4. Central Heating System Pressure Gauge
5. Optional Integral Timer Position
Neon Indicators
6. Flame Failure
7. Safety Thermostat Activated
8. Fault on Fan or Flue
9. Fault on Pump or Low System Pressure
10. Fault on Hot Water Sensor
11. Fault on Central Heating Sensor
12. Power On
13. Domestic Hot Water Mode
14. Central Heating Mode
15. Burner On
32145
6 7 8 9 10 11
12 13 14 15
KEY TO FACIA PANEL (Fig. 3)
When neons 6 to 11 are
constantly illuminated, they
indicate the temperature of
the central heating water.