Table of Contents
Advertisement
10.
FAuLT FINDING
10.1
INITIAL cHEcK
e)
Check that gas, water and electrical supplies are available at the boiler.
f )
The electricity supply should be 30V~ 50Hz. The preferred minimum gas pressure is 0mbar. The boiler pressure should be
pressurised to 0.5bar minimum when the boiler and the CH system are cold and no more than .5 bar when the system is hot.
g)
Carry out electrical system checks. i.e. Earth continuity, Resistance to earth, Short circuit and Polarity with suitable meter.
Note: These checks should be repeated after any fault finding and servicing.
h)
Ensure that all external controls are calling for heat and check all external and internal fuses.
i)
Before carrying out any servicing or replacement of parts, ensure that the gas and the electricity supplies are isolated.
10.2
APPLIANcE cONTrOLLEr
The boiler is fitted with an integrated single PCB controller for reliability. This PCB
controls all boiler functions and is also equipped with a 4 digit, 7 segment display
and push buttons on the front of the boiler as shown in figure 10.1. The display
shows the system status and can be used to display the diagnostic information as
described in the following sections.
The push buttons can be used to enter the parameter menu and to change the
parameters. The push button S1 (Labelled 'set/reset') is also used to clear locking
errors and reset the controller.
10.2.1
Normal (Level-0 i.e. Default) Display Functions
The information displayed on the 4 digit, 7 segment display in the normal user
(Level-0) mode is shown in figure 10.. If no input is detected from the push buttons
when the display is in levels 1 and mode for a period of about 30 seconds, it will
automatically revert to default level-0 mode.
ON : Low pressure safety trip - Press S1 to reset
OFF : Normal operation
ON : Overheat safety trip - Press S1 to reset
OFF : Normal operation
ON : HW demand active
(detected by flow switch)
OFF : No HW demand
(detected by flow switch)
FLASHING : Controller initialising
OFF
: Normal mode
ON : HW demand active
(detected by AT)
OFF : No HW demand
(detected by AT)
ON : Boiler pump running
OFF : Boiler pump off
ON : CH controls calling for heat
i.e. CH demand is active
OFF : No CH demand
Figure 10.2 - Level_0 Display Functions
Figure 10.1 - controller Display
D1 D2 D3 D4
S2
Set/Reset
CONSTANT 'P' : System pressure in bar
FLASHING 'P' : System pressure low
CONSTANT 'F' : Frost Protection active - Level 1
FLASHING 'F' : Frost Protection active - Level 2
NORMAL MODE : System pressure reading e.g. 1.5
FROST PROTECTION MODE : Boiler temperature e.g. 4
FLASHING/ON : Service required
OFF
: Normal operating mode
ON : Decimal point when displaying system pressure
FLASHING : Lockout error
clear by pressing 'Reset' button S1
ON
: Blocking error
OFF
: Normal operating mode
FLASHING : Controller in standby mode
ON
: Burner is on
OFF
: No power OR controller faulty
Page 41
S1
S3
Advertisement
Table of Contents
