Ariston microGENUS 23 MFFI Servicing Instructions
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Ariston microGENUS 23 MFFI Servicing Instructions

Type c boilers
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See also: User Manual , Instruction and Installation Manual
Servicing
Instructions
Type C Boilers
G.C.N: 47-116-14
47-116-15
LEAVE THESE INSTRUCTIONS
WITH THE END-USER
Country of destination: GB

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Summary of Contents for Ariston microGENUS 23 MFFI

  • Page 1: Servicing Instructions

    Servicing Instructions Type C Boilers G.C.N: 47-116-14 47-116-15 LEAVE THESE INSTRUCTIONS WITH THE END-USER Country of destination: GB...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SERVICING INSTRUCTIONS EPLACEMENT OF ARTS ENERAL CCESS - Removing the front panel - Removing the sealed chamber frontal cover - Removing the side panels CCESS TO THE OMBUSTION HAMBER - Removing the combustion cover - Removing the burner and jets - Removing the electrodes - Removing the main heat exchanger - Removing the air pressure switch...

  • Page 3: Replacement Of Parts

    2. The control panel moves downward and when pulled forward, SERVICING INSTRUCTIONS rotates on two lateral hinges; the panel stays in a semi- horizontal position, which allows access to the inner parts of To ensure efficient safe operation, it is recommended that the the boiler (F .

  • Page 4: Removing The Sealed Chamber Frontal Cover

    Removing the sealed chamber frontal cover Removing the side panels 1. Remove the screws “C” (F . 1.6); 1. Remove the four screws “D” for each side panel (F .1.8); 2. Lift the sealed chamber frontal cover from the locating pins 2.

  • Page 5: Access To The Combustion Chamber

    CCESS TO THE OMBUSTION HAMBER Removing the combustion cover 1. Remove the screws “E” (F . 1.10); 2. Lift off the combustion cover. Fig. 1.12 78 eps Removing the electrodes Before carrying out this procedure, unscrew and slide the burner forward (see previous section). 1.

  • Page 6: Removing The Main Heat Exchanger

    3. Remove screw “H” (F . 1.15); Removing the main heat exchanger 4. Gently slide the electrode downward (F . 1.16). 1. Drain the boiler of water; 2. Release the overheat thermostat sensor “I” (F . 1.17); 3. Release the two connection nuts “J” connecting the exchanger to the flow and return pipes (F .

  • Page 7: Removing The Air Pressure Switch

    Removing the air pressure switch Removing the fan 1. Disconnect the electrical connections “K” and silicon pipes 1. Disconnect electrical connections “N” and silicon pipes “L” from their connection points (F . 1.20); “O” (F .1.23); 2. Remove screws “M” on the top of the sealed chamber 2.

  • Page 8: Ervicing And Emoval Of The As Alve

    ERVICING AND EMOVAL OF THE ALVE Setting the minimum and the maximum power of the boiler Setting the gas pressures 1. Check that the supply pressure to the gas valve is a minimum of 20 mbar for natural gas. 2. To do this, remove the screw “A”. Fit the pipe of the pressure gauge to the pressure connection of the gas valve “B”.
  • Page 9 Regulating the heating power for natural gas (G20) model 23 model 27 CG007A Regulating the heating power for butane gas (G30) model 23 model 27 CG008A Regulating the heating power for propane gas (G31) model 23 model 27 CG009A “A” ABLE 2.01 Kg/h 2.00 Kg/h...

  • Page 10: Removing The Spark Generator

    Removing the spark generator 1. Disconnect ignition leads “T” by pulling upward . 1.27); 2. Remove the screw “V” (F . 1.28); 3. Remove the spark generator (F . 1.29). 61.eps Soft-light Max Heating Adjustment Adjustment VR015A.eps . 1.27 45.eps 10.

  • Page 11: Removing The Gas Valve

    Removing the gas valve CCESS TO THE ATER IRCUIT 1. Disconnect all the cables from the solenoid and Important! Before any component is removed, the boiler modureg; must be drained of all water. 2. Remove the spark generator (see previous section); 3.

  • Page 12: Removing The Safety Valve

    Removing the safety valve Removing the main circuit flow switch 1. Loosen nut “Z” (F . 1.36); 2. Unscrew and remove the valve (F . 1.37). 1. Remove the cable of the main circuit flow switch “B1” . 1.40); 2. Remove the screws “C1” (F .

  • Page 13: Removing The Pump

    Removing the pump 1. Remove the U-clip “ D1” (F . 1.41); 2. Remove the retaining clip “E1” (F . 1.42); 3. Remove the U-clip “ F1” (F . 1.43); 4. Release the nut “G1” (F . 1.44); 5. Remove the pipe “H1” (F .

  • Page 14: Removing The Pressure Gauge

    Removing the pressure gauge Removing the expansion vessel 1. Remove the U-clip “J1” and remove the pressure gauge 1. Loosen nuts “K1” and remove the gas pipe (F . 1.50); coupling (F . 1.48); 2. Loosen nut “L1” (F . 1.51); 2.

  • Page 15: Removing The Overheat Thermostat

    Removing the overheat thermostat Removing the D.H.W. temperature sensor (N.T.C.) 1. Disconnect overheat thermostat electrical 1. Pull off the electrical connector “Q1” and unscrew the connections “N1” (F . 1.54); sensor probe using a suitable spanner (F . 1.57). 2. Then remove the thermostat from its mounting by releasing the securing clip (F .

  • Page 16: Access To The Control System

    Removing the time clock CCESS TO THE ONTROL YSTEM 1. Unplug electrical connection “W1” from the clock (F Checking the fuses 1.62); 2. Remove the screws “W2” (see fig. 1.63); 1. Remove the inspection cover on the reverse of the 3.

  • Page 17: Removing The P.c.b

    Removing the P.C.B. 1. Isolate electricity; 2. Remove the inspection cover from the reverse of the control panel; 3. Unplug all electrical connections from the P.C.B. (F 1.65); 4. Remove the screws “X1” (F . 1.66); 5. Separate the facia panel from the rear of the control panel (F .

  • Page 18: Fault Finding

    FAULT FINDING It is possible to detect and correct any defect by using the standard fault AULT INDING UIDE finding diagrams described in this chapter. CHARTS PRELIMARY CHECKS MAKE SURE THAT: 1 - There is sufficient water in the system 2 - The gas is turned on 3 - The electrical supply is turned on...
  • Page 19 IS THE PUMP RUNNING? POWER TO THE PUMP? DOES THE "NO WATER" L.E.D. ILLUMINATE 1 - Check pump cable (WITHIN 40 SECS)? 2 - Check/replace P.C.B. 1 - Check if there is air in the 3 - Check main flow main system switch operation when 2 - Check main circuit flow switch...
  • Page 20 IS THE FAN RUNNING? BOILER 1 - Reset the boiler SHUTDOWN? 1 - Check/replace main circuit flow switch PUMP PROTECTION 2 - Check/replace ACTIVATED? connection cable 3 - Check/replace P.C.B. 1 - Check/replace air INTERNAL pressure switch P.C.B. PROTECTION 2 - Check if reset button ACTIVATED? is jammed 3 - Check/replace flame...
  • Page 21 IS THE AIR PRESSURE SWITCH ACTIVATED? CHECK P 1.2 mbar 1 - Check A.P. switch cable P ON TEST 2 - Check/replace A.P. switch PRESSURE 3 - Check/replace P.C.B. INTAKE 1 - Check exhaust discharge P 1.2 mbar 2 - Check venturi & pipes 3 - Check fan efficiency 1 - Check/replace ignition electrode...
  • Page 22 FAULTS POSSIBILE CAUSES Drawing D.H.W: THERE STILL - air in secondary heat exchanger When you turn on a tap A PROBLEM? - faulty main circuit flow switch burner switches off - faulty D.H.W. flow switch Drawing D.H.W: - faulty 3-way valve radiators heat up in summer mode Drawing D.H.W: - check C.H./D.H.W.

  • Page 23: Electrical Diagrams

    EGEND ELECTRICAL = Time Clock Connector DIAGRAMS = Central Heating Selection (Winter) and Temperature Adjustment = Connector for Total Check System = Domestic Hot Water Temperature Adjustment = Soft-light Adjustment = Maximum Heating Adjustment = On/Off Switch = On/Off L.E.D. = Fume Sensor L.E.D.
  • Page 24 microGENUS 23/27 MFFI SE017A SF014A B063...

  • Page 25: Short Spare Parts List

    20 21 32 33 code 998613 codes 998836 code 998940 999091 code 998099 code 997089 MODELS CHARACTERISTICS SERIAL NO: REF. VALIDITY MICROGENUS 23 MFFI METHANE 2320005600001 MICROGENUS 23 MFFI 2320005600001 MICROGENUS 27 MFFI METHANE 2320005600001 MICROGENUS 27 MFFI 2320005600001 B063...
  • Page 26 23/27 MFFI G.C. part ARISTON Description Part No. E61 468 379816 Expansion vessel 998616 573521 164 282 Gasket 3/8" 998077 E61 475 O-ring 573520 164 225 Gasket 3/4" 997147 E25 427 Motor (3- Way valve) 997077 E61 429 Fixing clip (motor)
  • Page 28 Manufacturer: Merloni TermoSanitari SpA - Italy Commercial subsidiary: MTS (GB) LIMITED MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT Telephone: (01494) 755600 Fax: (01494) 459775 internet: http://www.mtsgb.ltd.uk E-mail: info@mtsgb.ltd.uk Technical Service Hot Line: (01494) 539579...

This manual is also suitable for:

Microgenus 27 mffiMicro genius 27 mffiMicro genius 23 mffi

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