5.11
FLOW/RETURN REVERSED
5.12
CYLINDER THERMISTOR FAULT (IF FITTED)
5.13 EXTERNAL INTERLOCK OPEN
Check that the system pipework is correct
Reverse Pump
no
Is the Pump connected the correct way?
yes
Fit a new cylinder thermistor
no
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?
yes
Ensure the wiring has continuity and is
securely connected
no
Does the cylinder thermistor wiring between the boiler
terminal strip and the PCB have continuity and is
securely connected?
Replace main PCB
Change menu setting for DHW Sensor
to “Switched Live”
no
Is a DHW Thermistor connected to the boiler?
yes
Securely connect the wiring at both
the boiler and cylinder thermistor
no
Is the wiring securely connected at both the boiler and
cylinder thermistor?
yes
yes
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?
Replace the Interlock Relay Kit
Ensure that a link wire is securely connected
across the terminals marked “External
Interlock” in the boiler terminal strip
no
Reset the External Interlock
yes
Ensure the wiring has continuity and is
securely connected
no
yes
68
Installation & Servicing
SECTION 5 - FAULT FINDING
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
Summary of Contents for EVOMAX 2 30
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