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FAULT FINDING
58
mini HE --- Installation & Servicing
Continued from
page 53
Adjust the max setting
on the gas valve. Refer
to f rame 35. Check tha t
max burner pressure*
can be achieved.
Is the cold w ater supply
adequate? refer to frame
6 a nd Table 1 at pa ge 4.
yes
no no no
nono
no no no
yes
yes
yes
yes
yes
yes
Is there between 0V dc an d
16V dc at the connections
on the modul ating coil?
(0=min, 16=max)
Is there a temperature ri se
of 35 ûCacrosstheDHW
circuit at:
10.0 L/min 24 kW model
11.7 L/min 28 kW model
13.1 L/min 32 kW model
Rectify gas supply
fault.
Is there > 17 mbar
gas pressure at the
gas inlet?
Is there max burn er
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
14.0 L/min 32 kW model
Rectify water supply
fault.
Check the DHW inlet
filter. Remove debris
and clean or replace
filter.
With the DHW h ot
does the burner
pressure modulate if
the DHW temperature
setting is r educed to
minimum?
Boiler Operating
Correctly
Replace fau lty gas
valve.
Is the continuity o f the
modulator harn ess O.K?
Repair or r eplace
faulty wiring.
Replace faul ty PCB
* see Table 2 at page 4 for the correct v alue
yes
Is the burner pressure within
min an d max value* with
the boiler running?
no
Adjust burner pressure.
Refer to frame 35.
FAULT FINDING