HX Pool and Spa Heater
Page 7
FAULT INDICATION
Under fault conditions the thermostat will display a set of alpha numeric symbols to indicate the
status of the heater. The meaning of each symbol and action to be taken are listed as follows:
SYMBOL MEANING
ACTION
Temp Display
Unit has power.
No action.
F0
Heater locked off, thermistor
If water temperature reads
wire disconnected or water
greater than 0
°
C, phone for
at
0
°
C (freeze conditions).
service.
F1
Thermostat reads greater
Allow water to cool,
than
45
°
C.
turn heater off then on again.
F2
Mechanical Hi Limit greater
Allow water to cool,
than
45
°
C.
turn heater off then
on
again.
F3
Thermistor fault
Phone for Service
L
Heater locked out on time
No action. Heater will
delay for 2 minutes.
Automatically reset after
time
delay.
Or switch off then on again
for immediate ignition.
Pump operating & sufficient
No action.
water pressure to operate heater
Thermostat calling for heat.
No action.
Electronic Flame Supervision
operating.
