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18

No water or very low
flow rate.

Clear the blockage or replace
the hose or handset.

The hose or handset is
blocked.

FAULT DIAGNOSIS

Shower is too hot.

Turning the
temperature knob
does not affect the
water temperature.

The water continues
to flow when the
double pole switch is
turned off.

The incoming water is
warmer in the summer, so
the shower power setting is
too high.

The handset sprayplate is
blocked.

The handset sprayplate is
blocked.

Broken diaphragm.

Turn the power knob to

Medium

 and adjust the

temperature knob until the
desired temperature is
reached.

Regularly clean the handset
sprayplate. Refer to the

Maintenance 

section of the

handset manual.

Remove and clean the handset
sprayplate. Refer to the

Maintenance

 section of the

handset manual. If the fault
persists, contact the shower
installer.

Contact your installer to
replace the flow valve
assembly.

Malfunction

Cause

Remedy

Shower is too hot
during the summer.

The troubleshooting information tabled below gives you details on probable causes
and remedies should difficulties be encountered whilst the shower is in operation.

Warning! 

There are no user serviceable components beneath the cover of the

appliance.

ONLY A COMPETENT TRADESPERSON SHOULD REMOVE THE FRONT COVER!

The handset sprayplate is
blocked.

Clean the handset sprayplate.
Refer to the 

Maintenance

section of the handset manual.

The incoming water supply
stop valves, or the
appliance isolating valve, is
closed.

Open the stop/isolating valve
completely.

(Continued. . . .)

Summary of Contents for Mira Zest

Page 1: ...1 These instructions are to be left with the user Installation and User Guide ELECTRIC SHOWER MIRA ZEST...

Page 2: ...st with low interest rates PRICE MATCH always get the best deals available Boilers Radiators Heating controls Pipes ittings Cylinders Fires Renewable energy Bathroom suites Kitchen sinks taps Showers...

Page 3: ...tandards and Approvals 8 Flow Rate Graph 8 Installation Requirements 9 Plumbing 9 Electrical 11 Installation 12 Commissioning 14 Operation 16 Fault Diagnosis 18 Maintenance 22 Cleaning 22 Cleaning the...

Page 4: ...enjoy the full potential of your new shower please take time to read this guide thoroughly and keep it handy for future reference Mira Zest electric showers have separate controls for power selection...

Page 5: ...ers recommended outlet fittings should be used 8 If water leaks from the pressure relief valve maintenance will be required before the appliance can be safely used 9 There are no user serviceable comp...

Page 6: ...with the requirements of UK Water Regulations Bye laws Scotland Building Regulations or any particular regulations and practices specified by the local water company or water undertakers The installat...

Page 7: ...crews 1 x Mira Zest Electric Shower Documentation 1 x Installation User Guide 1 x Installation Template 1 x Guarantee Brochure Z Tick the appropriate boxes to familiarise yourself with the part names...

Page 8: ...7 SPECIFICATIONS 205 mm 103 mm 53 mm 310 mm Dimensions Wiring Diagram...

Page 9: ...e relevant directives for CE marking Flow Rate Graph 1 These curves are for the specified outputs at 240 V 2 All appliance heating elements have a manufacturing tolerance Flow rates may be above or be...

Page 10: ...ed away from the appliance 4 The appliance is fitted with an inlet connector assembly that is designed to accept plumbing supplies from the top or bottom The water supply can be fed with 15 mm pipe or...

Page 11: ...ale formation Appliance malfunction due to excessive limescale formation is not covered by the manufacturer s guarantee Your local water company will be able to advise on the hardness of water in your...

Page 12: ...ble is not mechanically protected 2 5 mm2 if mechanically protected 3 The minimum cable size cross sectional area must conform to BS7671 4 To obtain full advantage of the power provided by this unit u...

Page 13: ...points as shown on the template 3 Remove the installation template and drill the top two fixing holes Insert the supplied wall plugs Caution Do not drill into cables or pipes in the wall 4 Thoroughly...

Page 14: ...e bottom fixing hole 14 Remove the shower from the wall Drill the bottom fixing hole and insert the supplied wall plug 15 Thoroughly flush the mains fed cold water supply pipe Caution The supply must...

Page 15: ...hem reach the terminal block 22 Connect the conductors firmly into the terminal block Make sure that the bare cores of each conductor are securely trapped within each conductor clamp 23 If necessary f...

Page 16: ...nob to the MEDIUM position The temperature of the water should rise slightly Allow a few seconds for the warm water to reach the handset this shows that the MEDIUM power setting is operating correctly...

Page 17: ...verage shower temperatures will be held within a 6 C range provided that the minimum required pressure is maintained 4 Seasonal changes in the temperature of the incoming cold water supply and or fluc...

Page 18: ...as necessary Turn the knob clockwise for hotter water and anticlockwise for cooler water Wait 10 15 seconds for the adjusted temperature to reach the handset Note It is normal for the flow rate to cha...

Page 19: ...andset manual Remove and clean the handset sprayplate Refer to the Maintenance section of the handset manual If the fault persists contact the shower installer Contact your installer to replace the fl...

Page 20: ...ntact the shower installer Contact installer to replace faulty parts Failure of pressure switch micro switch or thermal switch Turn the temperature knob anticlockwise to reduce the water temperature T...

Page 21: ...rn off the heating element to reduce the water temperature Turn the temperature knob anticlockwise to reduce the water temperature DO NOT TAMPER with the thermal switch Turning the temperature knob do...

Page 22: ...er ball is ejected Reset the relief valve assembly refer to Maintenance Relief Valve Setting If the fault persists contact Customer Services The water cannot be turned off Replace the flow regulator a...

Page 23: ...ry use a kettle descalent in accordance with the manufacturer s instructions 6 Refit the components in reverse order Any maintenance must be carried out by a qualified tradesperson following the instr...

Page 24: ...regulator assembly 4 Using your finger push the ball back into the tank Do not remove the O seal 5 Refit the components in reverse order 6 Replace the cover If the cover does not fit easily rotate the...

Page 25: ...5 8 5 kW 439 79 Switch Assembly Rotary 439 81 Cover Assembly Zest 439 87 Terminal Block Assembly 439 88 Seal Pack components identified B 439 89 Screw Pack components identified C 439 90 Thermal Trip...

Page 26: ...25 Spare Parts Diagram 439 87 439 95 439 81 439 90 439 99 439 91 439 92 A 439 79 439 77 A B B B B 406 27 439 75 C C C C...

Page 27: ...26 NOTES...

Page 28: ...27 NOTES...

Page 29: ...28 1057732 W2 A Kohler Mira Limited January 2006 CUSTOMER SERVICE 7 5...

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