Thermo Technologies SMT 400 - Manual (Page 23)

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Problem: The controller does not function correctly and all the LEDs are
on.
Cause/Remedy: The unit may have been subjected to mains fluctuations or
failures beyond it’s specifications. To resolve this problem the
controller must be reset as follows:
(1) Switch off the mains supply to the unit.
(2) Remove the two restraining screws from the sides of the
controller (see section 2.1) then separate the
TOP controller from the BASE.
(3) Disconnect the PP3 battery from the controller.
(4) Now plug the TOP controller back onto the BASE and
switch on the mains supply to the unit.
(5) The Unit should now restart and display the THERMOMAX
opening screen. If the unit does not work at this stage, it
must be returned to your distributor.
(6) If the unit is now functional you must switch off the mains
supply to the unit, then disconnect the TOP from the BASE
and reconnect the PP3 battery.
(7) Replace the TOP controller onto the BASE and then
replace the two restraining screws.
Please note that this operation should be carried out by
qualified personnel only !
Switch on the mains supply to the SMT 400. The Unit should
now restart and display the THERMOMAX opening screen.
The clock should now be set.
Problem: The Auxiliary timer does not appear to function correctly.
Cause/Remedy: The SMT 400 can be programmed to use either Tank sensor 1
and / or Tank sensor 2 to control Auxiliary outputs 1&2 (see
Section 3.5 “Timer Screen”), therefore both Tank 1 and Tank 2
sensor must be connected to the unit.
Problem: The Auxiliary heater or water Pumps do not switch on when
they should.
Cause/Remedy: The user can check the five relay’s status by entering the
system diagnostics screen (see Section 3.7 “STATUS SCREEN
- System Diagnostics”). The relays may be switched to
manually OFF, AUTO normal operation, or manually ON. If the
external heaters or water pumps do not operate when the
relays are switched to “manually ON” then check the system
wiring (this should be carried out by qualified personnel only).
Check all “neutral” connections. Check that the relay current
specifications have not been exceeded. If your system is using
an external Mains Relay (contactor) as per wiring diagram in
section 2.3, then you should check connections to ensure they
have not loosened.
NOTE: Please disconnect the PP3 battery when the unit is
not in use.