IDEAL INSTINCT 40 User Manual page 60

84 CYLINDER THERMISTOR FAULT
Is a DHW Thermistor connected to the boiler?
yes
Is the wiring securely connected at both the boiler and
cylinder thermistor?
yes
Disconnect the wires to the cylinder thermistor. Check
the resistance using a suitable multimeter connected
across the thermistor's terminal pins.
At 25°C expect 9,700 - 10,300 Ω
At 60°C expect 2,400 - 2,600 Ω
At 85°C expect 1,000 - 1,100 Ω
Is the thermistor value correct?
Does the cylinder thermistor wiring between the boiler
terminal strip and the PCB have continuity and is
securely connected?
85 EXTERNAL INTERLOCK OFF
Is an External Interlock connected to the boiler?
yes
Has the External Interlock operated?
no
Does the wiring from the Interlock Relay (mounted
within the boiler) to the terminal strip have continuity and
is securely connected?
86 BCC FAULT
Is the correct BCC for the boiler securely inserted into
the slot at the front left of the PCB?
(identified by the label on the BCC)
yes
Replace the BCC with a new BCC (that is correct for the
boiler). After switching power on and resetting the boiler
does the fault disappear
60
FAULT FINDING
yes
no
Change menu setting for DHW Sensor
to "Switched Live" (See Frame 36)
no
Securely connect the wiring at both
the boiler and cylinder thermistor
no
Fit a new cylinder thermistor
no
Ensure the wiring has continuity and is
securely connected
yes
Replace main PCB
Ensure that a link wire is securely connected
no
across the terminals marked "External
Interlock" in the boiler terminal strip
yes
Reset the External Interlock
no
Ensure the wiring has continuity and is
securely connected
yes
Replace the Interlock Relay Kit
Securely attach the correct BCC for the
no boiler onto the PCB.Note: ensure the
correct orientation of the BCC by placing
the side marked "TOP" upwards.
yes
Replace main PCB
Installation & Servicing