Mikrofill Ethos 24cc Maintenance Instructions Manual Download Page 25

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FAULT FINDING

Chart 4

Check fan/flue gas system

Does fun run ?

YES

Is air pressure
switch activated ?

YES

Go to chart 5

Differantial air
pressure across
the air pressure
switch is greater
than 48 Pascal ?

YES

Check and if
necessary
replace air
pressure switch

Check and clean fan

Check flue and air intake are
correct and clean

Check air pressure switch tube is
clean

Is 230 Vac present
across fan terminals ?

Check air pressure switch
wiring connection

YES

Check and if necessary

replace fan

Check and if necessary
replace ignition board

Chart 5

Check D.H.W. and C.H. modulation

Boiler operated on
central heating mode

Boiler operated on
DHW mode

Does burner flame
modulate ?

Check wiring connection
to CH sensor

YES

Normal operation
carry out

Does burner flame

modulate ?

YES

Normal operation
carry out

Check wiring connection
to DHW sensor

Check DHW sensor and main control
board and replace them if necessary

Check CH sensor and main control board
and replace them if necessary

Check modulating coil and replace it if necessary

Summary of Contents for Ethos 24cc

Page 1: ...Mikrofill Ethos Condensing combination boiler Maintenance Instructions 24cc ...

Page 2: ... than switching off the boiler yourself The boiler allows heating up of water to a temperature less than the boiling point The boiler can be used only for those purposes for which it has been specially designed The boiler must not be touched by children or by an unfamiliar person to its operation The manufacturer disclaim all liability for any translations of the present manual from which incorrec...

Page 3: ...ETY DEVICES 7 3 SETTINGS 8 4 ROUTINE CLEANING and INSPECTION 10 5 REPLACEMENT OF PARTS 13 6 FAULT FINDING 21 6 1 Fault codes on LED display diagnostic panel 21 6 2 Fault Finding Charts 22 7 SERVICE PROCEDURE 26 7 1 Appliance Checks 26 7 2 Service Operation 26 7 3 Recommission System 26 7 4 Soundness Test 26 8 WIRING DIAGRAM 27 9 SHORT PARTS LIST 28 ...

Page 4: ... the diagram on the left I first speed II second speed III third speed Burner Pressure Nominal Output 1 2 mbar 8 9 kW 30400 Btu h 3 7 mbar 12 98 kW 40980 Btu h 6 9 mbar 13 75 kW 44400 Btu h 12 1 mbar 23 2 kW 78530 Btu h 12 3 mbar 23 3 kW 79555 Btu h 1 TECHNICAL AND DIMENSIONAL CHARACTERISTICS 1 2 Burner Pressure Adjustment Diagram 1 Table 1 0 1 2 3 4 5 6 0 1000 2000 3000 Water flow l h Head mCE I ...

Page 5: ... cold water which comes from Central Heating Return pipe is directed to pump inlet Water reaches to inlet of primary heat exchanger from outlet of pump With heat transfer in primary heat exchanger hot water is supplied Hot water that comes from primary heat exchanger is directed to Central heating outlet Diagram 8 Diagram 9 ...

Page 6: ...m shown as 2 Cold water which is supplied from Cold Water Inlet reaches to secondary heat exchanger inlet The heat is transferred between primary and secondary heat exchangers The secondary heat exchanger is installed inside primary heat exchanger The hot water which is supplied from Secondary heat exchanger outlet is directed to Domestic Hot Water Outlet For Central Heating system shown as 1 Ther...

Page 7: ...ult codes can be found in the Servicing Instructions General safety devices Air flow rate safety device If an obstruction even partial of the flue occurs for any reason whatsoever the built in safety system of the boiler will turn the boiler OFF and the fan will continue to run The boiler will be ready to operate when the fault has been cleared Overheat safety In case of boiler overheating the ove...

Page 8: ...ct the gas valve adjustment tool to adjustment nut and screw see diagram 34 Turn inner part see diagram 35 CLOCKWISE To increase the pressure ANTICLOCKWISE To decrease the pressure After adjustment connect electrical connector protective cover Maximum setting See values on table A Remove the protective cover from the gas valve adjuster Push the grey rod on tool Turn outer part see diagram 36 CLOCK...

Page 9: ...G When fit in the modulating current range varies from 30 230 mA NG to 50 310 mA LPG JP 2 when fit in the pump is not powered when working in Heating mode This feature addresses to systems with external pumps JP 3 when fit in the heating temperature range changes to 30 40 o C for underfloor systems JP 4 when fit in the three minute delay on restarting after a cut out due to the primary water tempe...

Page 10: ...rews of side panels from bottom side of the boiler see diagram 7 Lift each side panel up and remove 4 2 Front control panel Open the cover of control panel by pressing the push catch Turn the screws at two sides of panel in correct direction for gain access to lower part of boiler see diagram 8 Upper front panel Turn the plastic clips at two lower sides of panel in correct direction at 90o angle f...

Page 11: ...er see diagram 13 The washers must be kept for reassembly To remove heat exchanger easily undo pipes from hydraulic kit and pump see diagrams 14 and 15 Pull the heat exchanger as shown in diagram 16 Examine heat exchanger for any blockages or build up of deposits Clean heat exchanger with soft brush or vacuum cleaner Do not use any tool likely to damage painted finish of heat exchanger Reassembly ...

Page 12: ... gas valve remove burner from boiler by lifting up and pulling forwards from keyhole slots Note The washer between main burner and main burner gas supply must be kept for use on reassembly Remove ignition and flame sense electrodes from burner Unscrew and remove injector bar retaining screws and separate injector bar from burner Examine and clean injectors as necessary Note DO NOT use a wire or sh...

Page 13: ...e cock To empty entire central heating system Turn the red tap of central heating safety valve to the left when all isolation valves are open To empty only heating system of boiler Close all isolation valves and turn the red tap of central heating safety valve to the left To empty domestic hot water system Close all isolation valves except domestic hot water outlet Open one or more hot water tap 5...

Page 14: ... switch Locate air pressure switch situated inside sealed chamber on top left hand side Remove air pressure switch tube from air pressure switch Disconnect air pressure switch electrical connections Undo screws on top of boiler securing air pressure switch to boiler and remove switch Fit replacement switch to boiler in reverse order to removal noting that pressure sensing tube fits to left hand co...

Page 15: ... to PCB see diagram 31 Carefully pull off electrical connections to PCB Unscrew the screws fit the PCB to the control panel and lift out PCB Fit replacement PCB in reverse order to removal Note 1 Make sure that PCB connections are fully pushed onto replacement PCB 2 Set the heating temperature option to the same value as the old PCB refer to Installation and User instructions Diagram 31 Diagram 32...

Page 16: ... in reverse order to removal Note all washers must be fitted Open isolating valves on flow and return connections refill vent and pressurise boiler Check for leaks 5 8 To replace loss of water sensor Drain down heating circuit of boiler only as described previously Note It is not necessary to drain down entire heating system to carry out this work Locate system pressure sensor at front left handsi...

Page 17: ...cement module ensuring it is of the correct type for the boiler in reverse order removal Re connect ignition and flame sense leads the connections are uniquely sized to ensure correct replacement Re connect 2 pin and 12 pin multi plug onto module Refit cover ensuring all sealing grommets are correctly located in module body Tighten screws securing cover onto ignition module 5 10 To replace gas val...

Page 18: ...y valve seating is damaged it will be necessary to replace safety valve as a complete unit repair is not possible Drain down heating circuit of boiler only as described previously Disconnect discharge pipe from safety valve To reach the valve easier remove the right side panel as shown in diagram 7 Remove safety valve see diagram 45 Fit replacement safety valve in reverse order to removal Note The...

Page 19: ...se order to removal ensuring that sealing washer is fitted to pipe connection before tightening Ensure that expansion vessel charge pressure is 0 5 bar 7 5psi using a pressure gauge Refit boiler tighten all connections ensuring that all sealing washers are fitted before tightening Reconnect flue making sure that all joints are properly connected Open isolating valves on flow and return connections...

Page 20: ...rner as described in Routine Cleaning an inspection Pull out injector bar retaining rods and separate injector bar from burner Unscrew and remove injectors from injector bar Fit replacement injector to injector bar and tighten Note Make sure that injector size marked on each injector is the same as that given in Technical Data for the type of gas being used Reassemble burner and fit into boiler in...

Page 21: ...r to removal 5 23 To replace filter Remove the filter assembly as shown in diagram 53 Replace the filter assembly diagram 54 and reassemble in reverse order 5 24 To replace diaphragm To remove the pressure connection tubes remove the two clips diagram 55 and the screw diagram 56 Remove the diaphragm assembly from the hydroblock by unscrewing two connection screws diagram 57 Remove six screws diagr...

Page 22: ...his led is blinking there is a problem in heating system NTC 6 1 FAULT CODES ON LED DISPLAY DIAGNOSTIC PANEL When the reset button illuminates there is a problem in flame sense electrode or gas flow NOTE If many faults occur the highest priority one is displayed Priority in display increases from right to left Low pressure in heating system has the highest and the heating NTC problem has the lowes...

Page 23: ...d on now YES Is water pressure led flashing Repair external wiring fault NO Replace display board Replace main control board Yes NO Yes Water pressure is not set between 1 2 bar YES Check water pressure switch wiring connection NO Check and if necessary replace water pressure switch YES Set pressure to 1 2 bar NO Does fan run at full speed YES Does CH Pump run Chart 1 Check electrical supply C H w...

Page 24: ...ce overheat thermostat Chart 3 Check Central Heating Operation NO Go to chart 4 DHW taps closed Put CH temperature selector to maximum Ensure external controls are calling for heat Is heating system NTC led flashing NO YES Check and if necessary replace heating system sensor Is overheat thermostat led flashing Check and if necesary replace overheat thermostat YES NO Is 230Vac present terminals of ...

Page 25: ...wiring connection YES Check and if necessary replace fan Check and if necessary replace ignition board Chart 5 Check D H W and C H modulation Boiler operated on central heating mode Boiler operated on DHW mode Does burner flame modulate Check wiring connection to CH sensor NO YES Normal operation carry out Does burner flame modulate YES Normal operation carry out Check wiring connection to DHW sen...

Page 26: ...e main control board YES Reset lockout Does burner light now YES Is flame present before lockout condition NO Check gas supply is live and purged Check and if necessary replace gas valve NO YES Adjust with RLA ignition burner pressure Check and if necessary clean burner Check and if necessary clean injectors Check right position of spark electrode Check and if necessary clean flame electrode Check...

Page 27: ...move dust and deposits Check for signs of damage to electrical connections cables or components Clean burner injector ports and combustion chamber Clean flue ways including draught diverter and heat exchanger Clear and adjust ignition components Clean flame failure components Operate safety discharge valve and check external discharge outlet Re pressurise system where necessary Make sound any gas ...

Page 28: ...28 8 WIRING DIAGRAM ...

Page 29: ...ER 3002194493 14 ELECTRONIC CONTROL CARD 3004092615 15 IGNITION MODULE 3004092613 16 DOMESTIC THERMISTOR NTC 3002185060 17 HEATING THERMISTOR NTC 3002185065 18 WINTER ON SUMMER SWITCH 3004090601 19 RESET BUTTON 3004090671 20 WATER PRESSURE GAUGE 3004090673 21 CABLE GROUP 3004004605 22 OVERHEAT SAFETY VALVE 3002185050 23 IGNITION ELECTRODES 3004090120 24 FLAME SENSE ELECTRODE 3004090125 25 FAN 3007...

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