7:1:1 Control Fault Diagnostics
Before commencing a diagnosis it is recommended
that you familiarise yourself with the functions of
the Controls. These are detailed in the
Users
Instructions Section 1:4 and in Heater Control,
Section 2:4 The Control will diagnose and display
most of its own faults.
Self Check
The Control does a full self check during power up.
It also briefly lights all the LEDs and the Tempera-
ture Display so they can be checked for operation.
Demand Inputs
The front panel LEDs for Pool Demand and Heating
Demand are triggered from the Mains Inputs and the
chosen Priority. If they are not lit check the supplied
voltage, connections and Priority setting.
Relay Outputs
LEDs on the Control Board, beside the relays, are
directly connected to the relay outputs and show if
there is an output voltage to the Burner, Internal
Pump or Pool Pump. If they are not lit check the
output voltages, if correct replace the board. If lit,
check voltage at the component, replace if correct.
7: FAULT FINDING
7:1 Heater Control
If the Heater fails to start, make the following checks.
1.
Is the mains electricity supply switched On?
2.
Is there a Demand for Pool or Space Heating?
3.
For Space Heating is the Heater Thermostat
set to the desired temperature?
6.
Check the fuses which should have been
fitted to the mains electricity supply to the
Timeswitch/Heater. If the fuse has blown.
Replace it. If it blows again, call a Service
Engineer.
7.
Is the Filter LED lit? If it is, check Pool Pump
is running and the Filter is not blocked.
8.
Is the Overheat LED lit? If it is press the Reset
on the Control Panel.
If the fault is not permanently corrected by one of
these actions it is likely that a component is faulty
and will need replacing. This should only be carried
out by someone competent to do so.
IMPORTANT - E
LECTRICAL
S
AFETY
I
T
IS
ESSENTIONAL
THAT
BEFORE
ANY
PANELS
ON
COMPONENTS
ARE
REMOVED
FROM
THE
HEATER
,
THAT
THE
MAINS
ISOLATOR
IS
SWITCHED
OFF
.
Displayed Faults
The Control board detects and displays certain fault
conditions. The display alternates between two
codes.
Display Reason
Action
Err / No
Control board fault.
Power Off then On
again. If not corrected
replace board.
Oc / thb
Boiler sensor
Check connections,
Open Circuit.
if correct, replace
sensor.
Oc / thp
Pool sensor
Check connections,
Open Circuit.
if correct, replace
sensor.
Sc / thb
Boiler sensor
Check connections,
Short Circuit.
if correct, replace
sensor.
Sc / thp
Pool sensor
Check connections,
Short Circuit.
if correct, replace
sensor.
Log
The Control keeps a log of the number of times the
Pressure Switch operates. These can be examined
and reset to zero in Setup Mode. The Temperature
Display units and Priority can also be checked and
altered in this mode.
Setup Mode
To enter Setup Mode turn both temperature control
knobs to OFF.
The following must be carried out within 5 seconds.
To enter Setup Mode turn both Temperature Control
Knobs to OFF.
The following must be carried out within 5 seconds.
1. Turn on the Mains supply to the Heater.
2. Turn the Pool Temperature Control Knob ON.
3. Turn the Heating Temperature Control Knob ON.
4. Turn the Pool Temperature Control Knob OFF.
5. Turn The Heating Temperature Control Knob OFF.
The Control is now in ‘Setup Mode’ and displaying
the Heater temperature.
The Display can now show additional data as the
Pool Temperature Knob is rotated.
See Fig 7:1 and
Table 7:1
Settings that can be altered can be changed by
turning the Heating Temperature Control Knob On or
Off.
To leave ‘Setup Mode’ and retain the new settings,
turn off the Mains supply for a few seconds at any
time.
21
100 Gas Condensing Pool Heater
10/03/03
