P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
47
Error and Fault Codes
Table 10. Heater Error and Fault Codes
Fault Condi
�
on
Error Code
Displayed
Note
Troubleshoo
�ng
Water pressure switch
open
ERR PS
If water
fl
ow is established the
the error is cleared and normal
opera
�
on is resumed.
No water
fl
ow thru
heater
Hi temperature limit
switch open
ERR HLS
When the temperature falls
below 135°F the error is cleared
and normal opera
�
on is
resumed.
Water temperature a
�
er
the 1
st
pass through the
heater exchanger is more
than 135°F.
Air
fl
ow switch open
ERR AFS
If adequate air
fl
ow through the
blower is established within 60
seconds the heater will resume
normal opera
�
on. If the error is
not corrected within 60 seconds
the heater will need to turned
o
ff
by pressing the HEATER OFF
bu
�
on.
The blower is not on or
air thru it is being
restricted
Igni
�
on Control Module ERR IGN
To clear the error the HEATER
OFF bu
�
on must be pressed.
The Igni
�
on Control
Module was not able to
ignite the heater.
Automa
�
c gas shu
�
o
ff
ERR AGS
The front panel bu
�
ons will be
disabled. To reset the heater,
cycle power.
Water temperature a
�
er
the 2
nd
pass thru the heat
exchanger is more than
140°F
Excessive stack
fl
ue
temperature
ERR SFS
The front panel bu
�
ons will be
disabled. To reset the heater,
cycle power.
The temperature of the
stack
fl
ue is more than
480°F
Open stack
fl
ue sensor
E05
Shorted stack
flue
sensor
E06
The front panel bu
�
ons will be
disabled. To reset the heater,
cycle power.
Follow diagram on page
53
Open water
temperature sensor
E01
To clear the error the HEATER
OFF bu
�
on must be pressed.
Follow diagram on page
52
Shorted water
temperature sensor
126
Follow diagram on page
52
Follow diagram on page
53
Section 1. Troubleshooting