The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4
page 18
8. Fault finding guide
FAULT FINDING
The boiler is not
operating or radiators
are cold
Is the boiler
switched ON?
Switch boiler ON
NO
Is the green
LED light
ON?
YES
Are the MCB
(on master switch
board) and RCD
(in boiler and master
switch board)
switched ON?
NO
Switch ON MCB
NO
Switch ON RCD
RCD can't be
switched ON
YES
YES
Reset safety thermostat
and try again to switch
RCD ON
NO
Electrical part of boiler
(heater, switch, relay)
is faulty
Does
DISPLAY
show temperature
inside boiler?
NO
NO
YES
Is the
temperature of water
same as
desired?
YES
Wait for boiler to heat up
NO
Is the room
thermostat switched
ON?
YES
Switch ON room
thermostat
Check separation valves
NO
YES
Faulty control panel
NO
Please check the following before going through fault finding
flowchart.
Check the installation is correct.
All isolating valves are open.
The system is full of water (pressurised) and purged of air.
Programmer and controls outside of boiler are on.
Check the electrical supply is connected correctly and present
YES
One or more
heaters are faulty
Noise in heating pipes (Plus & PTV only) if heating circuit is small – reduce speed setting on pump.
