Riello RS 250 MZ, Installation, Use And Maintenance Instructions

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36
FAULTS/SUGGESTED REMEDIES
The control box supplied performs a diagnostic role by means of which it is possible to easily identify the possible causes of any malfunctions
(signal:
RED LED).
In order to use this function, it is necessary to wait at least ten seconds from the moment the control box is put in safety mode and press the lock-
out reset button for a minimum of three seconds.
Once the button has been released, the RED LED will start to flash, as illustrated in the diagram below.
The pulses of the LED constitute a signal spaced by approximately 3 seconds.
The number of pulses will provide the information on the possible faults, according to the table below.
RED LED on
wait at least 10 secs
Press button
for > 3 secs Signal Signal
Interval
3 secs
In the event of a burner lockout, more than two conse-
cutive burner reset operations could cause damage to
the installation. On the third lockout, contact the After-
sales Service.
WARNING
If further lockouts or burner faults occur, interventions
must only be made by qualified, authorised personnel
(as indicated in this manual, and in compliance with
the laws and regulations currently in force).
DANGER
Signal Problem Possible cause Recommended remedy
2 blinks
Once the pre-purging phase
and safety time have passed,
the burner goes into lockout
without the appearance of the
flame 1 - The operation solenoid lets little gas through . . . . . . . . Increase
2 - One of the two solenoid valves does not open. . . . . . . . Replace
3 - Gas pressure too low . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase pressure at governor
4 - Ignition electrode incorrectly adjusted . . . . . . . . . . . . . . Adjust, see fig. (C) page 14
5 - Electrode grounded due to broken insulation . . . . . . . . Replace
6 - High voltage cable defective . . . . . . . . . . . . . . . . . . . . . Replace
7 - High voltage cable deformed by high temperature . . . . Replace and protect
8 - Ignition transformer defective. . . . . . . . . . . . . . . . . . . . . Replace
9 - Incorrect valve or transformer electrical wiring . . . . . . . Check
10 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
11 - A closed valve upline the gas train . . . . . . . . . . . . . . . . Open
12 - Air in pipework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bleed air
13 - Gas valves unconnected or with interrupted coil . . . . . . Check connections or replace coil
3 blinks
The burner does not switch
on, and the lockout appears 14 - Air pressure switch in operating position . . . . . . . . . . . . Adjust or replace
The burner switches on, but
then stops in lockout - Air pressure switch inoperative due to insufficient air
pressure:
15 - Air pressure switch incorrectly adjusted. . . . . . . . . . . . . Adjust or replace
16 - Pressure switch pressure test point pipe blocked . . . . . Clean
17 - Poorly adjusted head . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust
18 - High pressure in the furnace . . . . . . . . . . . . . . . . . . . . . Connect air pressure switch to fan suction
line
Lockout during pre-purging
phase 19 - Defective motor control contactor . . . . . . . . . . . . . . . . .
(only three-phase version)
Replace
20 - Defective electrical motor. . . . . . . . . . . . . . . . . . . . . . . . Replace
21 - Motor lockout (defective electrical motor) . . . . . . . . . . . Replace
4 blinks
The burner switches on, but
then stops in lockout 22 - Flame simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace the control box
Lockout when burner stops 23 - Permanent flame in the combustion head or . . . . . . . .
flame simulation
Eliminate persistence of flame or replace
control box
6 blinks
The burner switches on, but
then stops in lockout 24 - Defective or incorrectly adjusted servomotor. . . . . . . . . Adjust or replace
7 blinks
The burner goes into lockout
immediately following the
appearance of the flame 25 - The operation solenoid lets little gas through . . . . . . . . Increase
26 - Ionisation probe incorrectly adjusted . . . . . . . . . . . . . . . Adjust, see fig. (C) page 14
27 - Insufficient ionisation (less than 5 A) . . . . . . . . . . . . . . . Check probe position
28 - Earth probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Withdraw or replace cable
29 - Burner poorly grounded . . . . . . . . . . . . . . . . . . . . . . . . . Check grounding
30 - Phase and neutral connections inverted . . . . . . . . . . . . Invert them
31 - Defective flame detection circuit . . . . . . . . . . . . . . . . . . Replace the control box
Burner locks out when shift-
ing from minimum to maxi-
mum output and vice versa 32 - Too much air or too little gas . . . . . . . . . . . . . . . . . . . . . Adjust air and gas
Burner goes into lockout dur-
ing operation 33 - Probe or ionisation cable grounded . . . . . . . . . . . . . . . . Replace worn parts
10 blinks The burner does not switch
on, and the lockout appears 34 - Incorrect electrical wiring . . . . . . . . . . . . . . . . . . . . . . . . Check
The burner goes into lockout 35 - Defective control box . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace
36 - Presence of electromagnetic disturbances in . . . . . . . .
the thermostat lines
Filter or eliminate
37 - Presence of electromagnetic disturbance . . . . . . . . . . . Use the radio disturbance protection kit