Ideal Boilers mini HE C24 - Page 54

FAULT FINDING
54
mini HE --- Installation & Servicing
Continued from
page 49
Adjust the max setting
on the gas valve. Refer
to frame 27. Check that
max burner pressure*
can be achieved.
Is the cold water supply
adequate? refer to frame
6 and Table 1 at page 4.
yes
no no no
nono
no no no
yes yes
yes
yes
yes
yes
Is there between 0V dc
and 16V dc at the
Grey and Black
connections on the
modulating coil?
(0=min, 16=max)
Is there a temperature rise
of 35 ° C across the DHW
circuit at:
10.0 L/min 24 kW model
11.6 L/min 28 kW model
Rectify gas supply
fault.
Is there > 17 mbar
gas pressure at the
gas inlet?
Is there max burner
pressure* when the
boiler first lights?
Is the maximum water
flow correct
10.0 L/min 24 kW model
12.0 L/min 28 kW model
Rectify water supply
fault.
Check the DHW inlet
filter. Remove debris
and clean or replace
filter.
With the DHW hot
does the burner
pressure modulate if
the DHW temperature
setting is reduced to
minimum?
Boiler Operating
Correctly
Replace faulty gas
valve.
Is the continuity of the
modulator harness
O.K?
Repair or replace
faulty wiring.
Replace faulty PCB
* see Table 2 at page 4 for the correct value
FAULT FINDING