Pentair MASTERTEMP 125 Guía De Instalación Y Usuario página 39

Heater Will Not Fire - B
Start
Is red "SERVICE
HEATER" LED "on"
YES
CONTINUE
Rev. C 3/2019
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.
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.
Check that water pressure is
within the adjustment range of
the Pressure Switch (0-5 psig)
Verify that switch wiring is OK
and Pressure Switch port 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 40
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
Section 5. Troubleshooting
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 require-
ment.
Minimum Flow Requirements
Model Flow
175 20 gal/min (76 LPM)
200 20 gal/min (76 LPM)
250 25 gal/min (95 LPM)
300 30 gal/min (114 LPM)
400 40 gal/min (151 LPM)
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
175 20 gal/min (76 LPM)
200 20 gal/min (76 LPM)
250 25 gal/min (95 LPM)
300 30 gal/min (114 LPM)
400 40 gal/min (151 LPM)
Go to "Diagnostic LED's",
(Pages 42 and 43)
39