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Heater Will Not Fire - B
Start
Increase POOL/SPA tempera-
ture setting on Membrane
Pad above actual water tem-
perature. Heater should fire
on demand for heat. If not,
and no other red LED’s light,
replace Control Board.
Service pump/filter and elimi-
nate other flow obstructions.
Heater should fire on call for
heat. Re-verify that water
flow is above minimum
requirement.
Minimum Flow Requirements
Model Flow
200 20 GPM
333 30 GPM
400 40 GPM
If water pressure is outside of
adjustment range that will
open switch with pump off
and close switch with pump
on, replace with flow switch
set above minimum flow
requirement.
Minimum Flow Requirements
Model Flow
200 20 GPM
333 30 GPM
400 40 GPM
Is red “SERVICE
HEATER” LED “on”
YES
YES
NO
YES
NO
NO
Is red “SERVICE SYSTEM”
LED on?
Verify that pump is on, filter is
not blocked, and the water
flow is above the minimum
requirement.
Check that water pressure is
within the adjustment range of
the Pressure Switch (0-5 psig)
Verify that switch wiring is OK
and sensing tube is not
blocked, and replace water
Pressure Switch.
Check whether any of the
red diagnostic LED’s on back
of board (AGS, AFS, SFS,
HLS or PS) are “on”
GO TO
“HEATER WILL NOT FIRE - C”
Page 26
Go to “Diagnostic LED’s”,
(Pages 28 and 29)
With pump running, adjust
Water Pressure Switch to
lower pressure until ‘SER-
VICE SYSTEM” LED goes
out. Then verify that “SER-
VICE SYSTEM” LED goes on
with pump off.
YES
YES
YES
NO
NO
NO
CONTINUE