Riello RLS 190/M MZ, Installation, Use And Maintenance Instructions

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SYMBOL PROBLEM POSSIBLE CAUSE RECOMMENDED REMEDY
The burner does not start
No electrical power supply Close all switches and check connections
A limit or safety thermostat/pressure switch open Adjust or replace
Control box lockout Release the control box
Control box fuse interrupted Replace it
Incorrect electrical wiring Check
Defective control box Replace
No gas supply
Open the manual valves between meter and
train
Mains gas pressure insufficient Contact your gas company
Minimum gas pressure switch fails to close Adjust or replace
Air pressure switch in operating position Adjust or replace
The servomotor contact does not intervene (closure
cam 0°) Adjust the closure cam 0° or replace the servo-
motor
The burner does not switch
on, and the lockout appears
Flame simulation Replace the control box
Faulty motor remote control switch Replace
Defective electrical motor Replace
Motor lockout Release the thermal relay
The burner starts up but
stops at the damper maxi-
mum opening
The servomotor contact does not intervene (maxi-
mum cam opening) Cam adjustment (maximum opening)
or replace the servomotor
The burner switches on, but
then stops in lockout
Air pressure switch does not switch owing to lack of air pressure:
Air pressure switch poorly adjusted Adjust or replace
Pressure switch pressure point pipe blocked Clean
Poorly adjusted head Adjust
Dirty fan Clean
High depression in the furnace Contact our Technical Department
The burner turns on and
then remains in lockout
mode
Failure to the flame detection circuit Replace the control box
The burner remains in pre-
purging phase The servomotor contact does not intervene (mini-
mum cam) Cam adjustment (minimum)
or replace the servomotor
Once the pre-purging and
the safety time has elapsed
the burner goes into lockout
without the flame appearing
Gas pressure too low Increase pressure at governor
Ignition electrode incorrectly adjusted Adjust it
Electrode grounded due to broken insulation Replace
Faulty or grounded high voltage cable Replace
High voltage cable deformed by high temperature Replace and protect
Faulty ignition transformer Replace
Incorrect valve or ignition transformer connections Redo them
Defective control box Replace
A closed valve upline the gas train Open
Air in pipework Bleed air
Lockout with flame appear-
ing
The VS or VR solenoids let too little gas through Increase
Dirty flame sensor Check, replace flame sensor
Faulty connection Check, replace flame sensor
Insufficient detection current
(min. 6 µA)
Measure current, replace flame sensor
Flame sensor exhausted, faulty Replace
Maximum gas pressure switch intervention Adjust or replace
Defective control box Replace
The burner continues to re-
peat the start-up cycle, with-
out lockout
The gas pressure in the gas mains lies very close to
the value to which the minimum gas pressure switch
has been set.
The sudden drop in pressure after valve opening
causes temporary opening of the pressure switch it-
self, the valve immediately closes and the burner
comes to a halt.
Pressure increases again, the pressure switch clos-
es again and the ignition cycle is repeated.
The sequence repeats endlessly.
Reduce the minimum gas pressure switch inter-
vention pressure.
Replace the gas filter cartridge
Lockout without symbol indi-
cation
Flame simulation Replace the control box
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