Elecro 900
Series Digital Heaters:
Trouble Shooting
Problem:
Heater will not switch from
Standby mode (yellow neon)
to Heater On mode (red
neon)
In
most cases this will be the
result of one of the
following:
-
The set
point value of the digital
controller has been
achieved or is lower than
the current displayed
temperature. To confirm
that the digital controller
is calling for the unit to
heat. see if there is an
illuminated dot (5) above
the word 'Out' on the
digital display. If
illuminated go to step
-
If
not illuminated raise the
set point to the value
higher than that being
displayed on the
controller. Confirm whether
the heater now switches to
'Heat On' mode.
The Flow Rate through the
Heater needs to be
confirmed to be sufficient.
Switch off the circulating
pump and unscrew the flow
switch. Manually move the
paddle of the flow switch
to simulate water flow. If
the heater switches to
'Heat On' mode release
paddle immediately to
ensure the unit does no
overheat. Reinstall the
flow switch and increase
flow through the heater.
Choked filters or blockages
can cause reductions in
flow.
If
having performed the above
tests the heater still is
not operational the manual
reset high limit stat needs
to be checked. Isolate
power to the heater and
drop the front cover away
from the control box. The
High limit stat is located
in the base of the control
box. Press the red button
in the centre of the stat
(see diagram 1) if a
positive 'click' is felt
the stat has been reset. If
the stat has tripped, it
indicates that an overheat
situation has occurred.
This will need to be
investigated.
Problem: Manual reset
high limit thermostat has
tripped.
Possible causes are:
-
Air pockets
forming in the tank of the
Heater, in which case
plumbing will need to be
modified to ensure that the
heater is purged of air
during operation. Air
purging can be enhanced by
slightly raising the outlet
port of the heater so that
it operates on a small
incline. i.e. water enters
low and exits high.
-
Weed/debris
has built up around the
heating element, preventing
heat from effectively being
transmitted to the flowing
water. If this is the
problem end fittings should
be removed from the heater
and the element cleaned.
If after
checking the above your
heater still fails to
operate, then please
contact us for further
advice on
01377 24 00 32 (UK
Calls Only)
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