Cranborne THI 5-25c, Installation, Commissioning And Servicing Instructions

Page: 57 / 66

- 64 -
OPERATING FAULTS
Safety device activated Check that shunt X10-03 is present and that
the wires are properly connected
No flame formed after the safety time
period Check that the gas reaches the boiler (Pi),
check the condition of the gas valve, if there
is a major adjustment fault on the gas valve,
check the condition of the transformer,
cables, ignition electrode, ionisation current
value
Flame failure while the boiler is operating Check and adjust the gas valve, check the
ionisation electrode and the connections,
possible live-neutral inversion of the
transformer supply
Segment number or unauthorised
addressing on LPB or LMU Check the addressing consistency
Incompatibility between the LMU and LPB Check the addressing consistency
New LMU configuration The boiler must be reset when a clip-in is
installed or removed.
LMU setting error LMU setting problem
The boiler is blocked Press Reset to clear the message
Violation of the plausibility criteria (STB
related criteria) Check the value of the criteria related to the
boiler overheating security
The minimum speed threshold of the fan
is not reached Check the wiring of the fan and LMU, ensure
that the fan is turning correctly
The maximum speed threshold of the fan
is exceeded Check the mains supply and the fan cable
connections
The cleaning function is active -
The regulator shut-down function is active -
The boiler is in setting mode This appears after one or more settings are
loaded either by the QAA73 or by the PC
TOOL. This means that a reset is necessary
to validate the new setting(s) and for the
boiler to return to normal operating.
Display Description Solution