Table of Contents
Advertisement
4.8
FLOW THERMISTOR FAULT
Is the wiring securely connected to the Flow Thermistor
Located in the Flow Pipe lower LHS of Boiler
Disconnect the wiring from the Flow Thermistor
Check the resistance using a suitable multimeter connected
across the Thermistor's terminal pins.
Temperature
25
o
C
60
o
C
o
85
C
Is the Thermistor value correct?
Is the wiring securely connected to the low voltage 6 way
connector at the front left hand side of the PCB?
4.9
RETURN THERMISTOR FAULT
Pump Housing
Check the resistance using a suitable multimeter
connected across the thermistor's terminal pins.
Temperature
o
25
C
60
o
C
85
o
C
Is the Thermistor value correct?
Is there continuity between the PCB and the Thermistor?
Replace PCB
52
Section 4 - Fault Finding
YES
Resistance kΩ
9.7 – 10.3
2.4 – 2.6
1.0 – 1.1
YES
Resistance kΩ
9.7 – 10.3
2.4 – 2.6
1.0 – 1.1
YES
YES
NO
Securely connect the wiring to the Flow
Thermistor
NO
Fit a new Thermistor
NO
Securely connect the wiring to the PCB
Replace PCB
YES
NO
Fit a new Thermistor
NO
Check and replace wiring as necessary
Installation and Servicing
Hide quick links:
Advertisement
Table of Contents
Need help?
Do you have a question about the LOGIC MAX SYSTEM2 S15 and is the answer not in the manual?