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CUSTOMER STORY
We went to a customer
recently who had a serious
problem with their 30 CXI
Combination boiler. The
boiler would not heat up the
domestic hot water supply
nor would it operate the
central heating. After
careful testing out it was
found that the diverter
valve was not moving into
the "hot water" position.
This can sometimes be cured
with a simple addition of
Sentinel X200 system
restorer - a liquid
additive, and then flushing
the system clean. But that
didn't cure this boiler.
Further examination showed
that the diverter valve
central pin was seized solid
-even when it was out of the
boiler and on a work bench.
In fact it was locked up so
badly that even with pliers
and grips it could not be
moved! To cure this, all of
the diverter valve was
rebuilt with new Glow worm
parts, and a new actuator
[motor] was installed.
This did not repair the
fault:- the hot water
worked, but still not the
central heating. It was
discovered that the water
was circulating though the
by-pass valve. The old part
was removed and on
examination is was found
that a spring had corroded
and broken, so no pressure
was available in the system
[see pictures]. A new valve
was purchased and fitted yet
this also did not cure the
problem.
At this point we started
to have self doubts, asking
ourselves if the valve was
put together correctly etc.
etc. So we took the new
actuator out of the boiler
and tested if it was was
moving far enough. It did
not move at all [see
pictures]. A new circuit
board was needed.
So there were 3 separate
faults on this boiler. These
include 2 mechanical,
water-side faults and 1
electrical fault. All of
this repair work was
probably caused by a someone
cutting corners- by:
- Not flushing the old
system clean,
- Contractors offering
the cheapest quote but
not being able to
complete their work
correctly,
- OR even more
worrying, the installer
was not CORGI
registered nor competent
to install this system
in the first place.
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