FAULT FINDING

75 H......F

(FLAME DETECTION - SHORT CIRCUIT ERROR)

Remove flame detection electrode terminal from PCB.

NO

Is there continuity between the 2 terminal pins ?

YES

Replace flame detection electrode

Replace PCB.

FINDING FAULT FINDING FAULT FINDING FAULT FINDING

76 H.....4...... (FLUE THERMISTOR ERROR)

Can the fault condition be reset by switching

off the mains supply to the boiler ?

NO

Check wiring for continuity from the

PCB to the flue thermistor

Check resistance, using a suitable multimeter connected across the thermistor terminal pins.

At 25 oC

expect

9,700

- 10,300

Ohms

At 60 oC

expect

2,400

-

2,600

Ohms

At 85 oC

expect

1,000

-

1,100

Ohms

Are thermistor values correct ?

 

YES

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H9/L9 (HEAT EXCHANGER OVERHEAT)

Is the system filled and vented and all

isolation valves open ?

Is the pump operating correctly? Ensure

flow through system.

YES

NO

Fill and vent the

system and open all

isolating valves

Check resistance, using a suitable multimeter connected across the flue thermistor terminal pins.

At 25 oC

expect

9,700

- 10,300

Ohms

At 60 oC

expect

2,400

-

2,600

Ohms

At 85 oC

expect

1,000

-

1,100

Ohms

Are thermistor values correct ?

YES

NO

FAULT

Replace PCB

Replace thermistor

Inspect heat

exchanger for

blockage or damage

in the flueways.

Clean or replace as

necessary

Note.

Replace thermistor

FAULT FINDING

With V9 Primary Control PCB, overheat LA/HA or H9/L9 when reset will display 3 horizontal lines and will not attempt to refire until the temperature in the heat exchanger drops below 50oC.

77 H......n

(PHASE REVERSAL ERROR)

Check wiring to the boiler for

reversed live and neutral

48

icos - Installation & Servicing

Page 48
Image 48
IDEAL INDUSTRIES HE24, HE18, HE12 75 H......F, Flame Detection Short Circuit Error, 76 H.....4...... Flue Thermistor Error

HE12, HE15, HE18, HE24 specifications

The IDEAL INDUSTRIES HE series, comprising the HE24, HE18, HE15, and HE12 models, represents a significant advancement in the field of electrical testing and measurement tools. These versatile testers stand out in professional environments for their high accuracy, user-friendly interfaces, and advanced features designed to enhance efficiency and reliability in electrical inspections.

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