Servicing instructions
THIS IS A CAT II2H3+ APPLIANCE
SYLVA
01773 828100
I N W A R R A N T Y
T E C H N I C A L H E L P L I N E
01773 828400
Page 1: ...Servicing instructions THIS IS A CAT II2H3 APPLIANCE SYLVA 01773 828100 IN WARRANTY TECHNICAL HELPLINE 01773 828400...
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Page 3: ...switch 6 Printed circuit board 6 Central heating thermistor 6 Central heating temperature control 6 Pump 6 7 Temperature gauge 7 Pressure gauge 7 3 way valve head 7 3 way valve 7 Loss of water switch...
Page 4: ...fluid The maximum domestic hot water flow rate is 12 litres minute Remove boiler casing as follows Upper front panel Remove by pulling free from the spring clips at the top and bottom Side panels Rem...
Page 5: ...only of storage cylinder preferably when cold Isolate electrical supply to boiler Close isolating valve c on cold water inlet pipe see diagram 3 Drain upper section only of storage cylinder by attach...
Page 6: ...rew and disconnect two incoming mains wi res Unscrew and disconnect two mains warning light wires Remove screws securing PCB to control panel and lift out PCB Fit replacement PCB in reverse order to r...
Page 7: ...drain down entire heating system to carry out this work Remove 3 way valve head as described previously Unscrew three nuts securing 3 way valve to pipework and lift out 3 way valve making note of the...
Page 8: ...connection on fixing jig see diagram 3 Refill storage tank and vent cylinder Check for leaks To replace anode To replace anode it is necessary to drain upper sec tion only of storage cylinder preferab...
Page 9: ...nscrew and remove screws securing expansion vessel to boiler Lift vessel out of boiler Fit replacement vessel to boiler in reverse order to removal ensuring that sealing washer is fitted to pipe conne...
Page 10: ...Cold water inlet C Heating flow D Domestic hot water flow F Gas supply 1 3 way valve 2 Loss of water switch 3 Pump 4 CVI unit 5 Gas valve 6 Ignition electrode 7 Injector manifold 8 Flame detection ele...
Page 11: ...81 m3 h 2 10 kg h 2 06 kg h Gas rate minimum 1 32 m3 h 0 98 kg h 0 97 kg h Gas reference 15 1013 mbar Burner pressures burner pressures as listed in the table below must be checked after the boiler ha...
Page 12: ...tors A7 Clock option connector BR Reset button CTN Thermistor EV1 Modulating valve EV Main gas valve EX Fan E H Summer Winter switch F1 F2 F3 Fuses FA Ignition elctrode FL Flame sense electrode IG Mai...
Page 13: ...works but the heating doesn t refer to chart No 1 If heating works correctly but the hot water doesn t refer to chart No 2 IMPORTANT Always adopt a logical step by step procedure starting at the begin...
Page 14: ...tral heat ing potentiometer Replace central heating thermistor Faulty PCB replace Are heating controls calling for heat NO NO NO NO NO YES DHW ok Replace domestic hot water thermostat Replace 3 way va...
Page 15: ...fitted and free of obstructions Check for correct fit of sealed chamber cover Is pump running at full speed Does burner remain on for less than 5 seconds Is fan running at full speed Refer to chart N...
Page 16: ...al heating safety valve 56110 12 Expansion valve 6bar 56029 13 T P relief valve 7bar 56108 14 Anode 56000 15 High limit thermostat 56012 16 Ignition flame sense electrode 56002 85890 B 07 97 CHART N 5...
