VOKERA MYNUTE 35HE Installation & Servicing Instructions Manual Download Page 26

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7.8.3

POLARITY CHECK

With the appliance connected to the electrical
supply and using a suitable multimeter, carry out
the following voltage tests:

●

connect test leads between the Live & Neutral
connections at the appliance terminal strip (fig.17).
The meter should read approximately 230V ac.
If so proceed to next stage. If not, see 7.8.4.

●

connect test leads between the Live & Earth
connections at the appliance terminal strip (fig.17).
The meter should read approximately 230V ac.
If so proceed to next stage. If not, see 7.8.4.

●

connect test leads between the Neutral & Earth
connections at the appliance terminal strip (fig.17).
The meter should read approximately 0 - 15Vac.
If so polarity is correct. If not, see 7.8.4.

7.8.4

REVERSED POLARITY OR SUPPLY FAULT

Repeat the above tests at the appliance isolator,
if testing reveals correct polarity and/or supply at
the isolator, re-check wiring and connections be-
tween the isolator and the appliance.
If tests on the isolator also reveal reversed polarity
or a supply fault, consult the local electricity
supplier for advice.

7.8.5

RESISTANCE TO EARTH CHECK

Isolate the appliance from the electrical supply
and, using a suitable multi-meter, carry out a
resistance test. Connect test leads between the
Live & Earth connections at the appliance terminal
strip (fig. 17). If the meter reads other than infinity
there is a fault that must be isolated, carry out a
detailed continuity check to identify the location of
the fault.

These series of checks must be carried out before
attempting any faultfinding procedures on the
appliance. On completion of any task that required
the disconnection and re-connection of any elec-
trical wiring or component, these checks must be
repeated.

7.9

FAULT FINDING

Before attempting any faultfinding, the electrical
checks as detailed in 7.8 must be carried out.

Isolate the appliance from the electrical supply.
Disconnect any external controls from terminal
plug M6 (fig. 39) and insert a link-wire between the
two Black wires at terminal plug M6 (fig. 39).

Code

eason

false flame

restart ignition

check the wiring harness

high limit flow temperature probe

high limit return temperature probe

internal fault

fan error

internal fault

low water pressure

DHW NTC error

flow NTC error (2

CH)

over heat underfloor thermostat (2

CH)

flow/return

∆

T error (2

CH)

condensate level high

condensate sensor error

NOTE

Restore the electrical supply to the boiler and turn
the selector switch to the on position. The boiler
should now function as described in section 7.2.
Should the boiler fail to respond, the internal fuses
and connectors should be checked to ensure in-
tegrity and continuity. If the boiler still fails to
respond, refer to the detailed faultfinding flowcharts
overleaf.

7.10

TEMPORARY FAULT CODES

The built-in fault diagnostic system automatically
displays a unique fault code that can be used to
determine why the boiler has temporarily locked
out. When the boiler displays a temporary fault
code, the appropriate code is shown flashing on
the display, accompanied by the symbol

7.11

FINAL FAULT CODES

When the boiler displays a final fault code, the
appropriate code is shown flashing on the display,
accompanied by the symbol

(RESET).

7.11.1 CODE ERROR +

(RESET) ONLY

To reset the boiler, push button. If the boiler
starts without any problems, the lock-out is prob-
ably due to an accidental situation.

7.11.2 CODE ERROR +

(RESET) +

Refer to the following section and the detailed fault
finding flowcharts overleaf.

Code

Reason