section 6: Fault Finding
Page 13
6.2 FaULt DiaGnOsis FLOW CHaRt
The following flowchart can be used to determine and rectify a
fault in the operation of a Grant Solo fan convector.
Please first carry out the simple checks, as detailed in Section
6.1, before using the flow chart below.
! WaRninG !
Exposure to live electrical connections.
The following fault-finding procedures should only be
conducted by a suitably qualified competent person using
the correct test equipment.
START
Check electricity supply
is turned on at the
fused isolator.
Turn unit off and on
using the mains ON/
OFF switch
Electrical problem
230V AC at 3 way
terminal block
Are there any lights
illuminated on the
control panel?
Other problem
Fix issue with mains
power supply
230V AC after mains
ON/OFF switch
Replace mains ON/
switch (SP0068)
Power at grey and
white wires at PCB
~10V AC
Replace transformer
(SP0012)
Any lights illuminated
on the control panel
Replace power and
control PCB (SP0129)
and user interface PCB
(SP0128)
Boost light flashing
20°C indicator light
(2 bars) flashing?
Check fans are running
heat is being emitted
Check power on fan
output (blue wire) on
PCB ~50V AC
Replace transformer
(SP0012)
Check hot water supply
to Solo is above 29°C
Is the heat source
functioning correctly
Fix issue with heating
source
Check that the system
is balanced
Inlet pipe to the radiator
is above 29°C
Balance radiators on
the system to ensure
flow to the Solo
Air and water
temperature sensor
connected?
Re-connect sensor.
Replace temperature
sensor if necessary.
(SP0350)
Check fans are running
and heat is being
emitted
Contact your installer /
service engineer
PROBLEM
RESOLVED
Replace fan (SP28-
24) and capacitor
(2μF - SP0229 / 4μF -
SP0237)
NO
YES
YES
NO
NO
YES
YES
YES
NO
NO
YES
NO
YES
YES
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
The air temperature sensor
can be disconnected at this
point to stimulate cold room
temperatures and force the
20°C indicator light (2 bars) to
flash and fans to run
