SECTION 7
-
The HIU Controller first power up and set up
Page 21
SECTION 10
-
Fault and Error Codes / Fault finding guide
Power on, HIU operating
normally
YES
NO
NO POWER?
Comply with all safety provisions.
Installation and maintenance can only be car-
ried out by a qualified and competent plumb-
ing installer and a qualified and competent
electrical installer in accordance with the cur-
rent document Building Regulations, Legisla-
tion and Standards.
SAFETY
!
–
before any electrical work or
maintenance ensure that the electrical supply
is isolated.
DANGER
–
immediate risk of physical injury or
even death.
Check that the volt free connections
for room thermostat or Prepayment
have NOT been wired to 230V
Is there power to the
fused spur connecting to
the HIU?
Check power supply and
Fuse feeding to the HIU.
Fused spur requires a
13A Fuse all correct?
Turn off the potential power
supply using the isolation
switch fused spur. Check Fuse
and wiring within the HIU.
6.3 AMP Glass Fuse
NO
If 230 v has been applied to the room
thermostat connections then the
controller maybe damaged beyond
repair and will have to be replaced.
Warranty will not cover this!
YES
Check power is on the HIU electronic
controller. Remove the installer panel
and check Live and Neutral connections.
Are they connected?
YES
Power is at the connections to
the controller, but the controller
screen is blank.
O
Make good the electrical
connections to the HIU
controller.
Order a HIU new controller
and replace
NO
YES
YES
YES
06/21 E&OE