IDEAL LOGIC + Combi 24 Installation And Servicing page 58

80 NO WATER FLOW LOCKOUT - 1 FILL sysTEM TO 1.0 BAR - 2 BLEED RADIATORs -
3 ChECK RADIATOR VALVEs OpEN - 4 REsET BOILER - 5 CONTACT INsTALLER
Is the Boiler and CH System filled with water and all
isolation and radiator valves open?
Reset the boiler. Is the Flow/Return Differential
across the Boiler in excess of 30°C?
Check the No Water Flow Thermistor
(Refer to Frame 73).
Check resistance using a suitable multimeter
connected across the thermistor's terminal pins
At 25 C expect 9,700 - 10,300
o
At 60 C expect 2,400 - 2,600
o
At 85 C expect 1,000 - 1,100
o
Does the boiler now work OK?
REsET pROCEDURE - To reset boiler, turn mode knob to reset position and immediately turn knob back to required setting.
81 FAULT 8 - CONTACT INsTALLER (FALsE FLAME LOCKOUT)
Reset the boiler, does Boiler Work OK?
Separate the flame detection electrode in-line
connector. Is there continuity between the terminals
pins connected to the electrode?
Check routing and integrity of internal boiler wiring.
REsET pROCEDURE - To reset boiler, turn mode knob to reset position and immediately turn knob back to required setting.
82 LOW WATER pREssURE - 1 FILL sysTEM TO 1.0 BAR -
3 CONTACT INsTALLER
Are the Boiler and CH System filled with water and
all isolation and radiator valves open (check pressure
gauge is between 1 to 1.5 bar)?
Are connections on water pressure sensor secure?
Replace water pressure sensor
58
FAULT FINDINg
YES
NO
Ohms
Ohms
Ohms
NO
NO
YES
YES
NO
Fill and vent the system and open all
isolation valves, reset the boiler
Check pump connection and check
YES
that the Pump is rotating freely. Is the
Differential now below 20°C?
NO
Replace the Pump
Check the Flow and Return Thermistors
Check resistance using a suitable multimeter
connected across the thermistor's terminal pins
NO
At 25 C expect
o
At 60 C expect
o
At 85 C expect
o
Check routing and integrity of internal boiler
YES
wiring is OK. Check condition of Flame Sense
Electrode and replace if deteriorated.
YES
Replace Flame Detection Electrode
NO Fill and vent the system and open all isolation valves
NO
Re-fit connections
+
Ideal Logic
YES
OK
(Refer to Frame 53)
9,700 - 10,300
2,400 - 2,600 Ohms
1,000 - 1,100 Ohms
2 BLEED RADIATORs -
Combi -
Installation and Servicing
Ohms