Pentair Mastertemp 175K BTU/HR Installation And User Manual page 44

Diagnostic LED's: SFS
SFS "on"
He ater starts a nd run s O K,
but temperature of e xh aust
climbs to 45 0˚–5 00˚ in 3–5
minutes.
NO
Hea ter starts afte r se ve ral
trie s, exhau st te mp erature
stays b elow 250 ˚.
OR
Hea ter d oesn't start at all
(exhaust stays cold ).
Check pressure and volume
of fuel supply
OK
Disco nnect the sen so r and
check con tin uity acro ss its
terminal s. Resistance
shoul d be 3.5-4 .0 meg a-
oh ms.
= o pe n circu it;
0 = shorted.
Does sensor check OK?
Y ES
Check co ntinuity i n wiring
ha rness between Control
Bo ard an d Prob e.
YE S
Continu ity OK ?
NO
Check the J3 a nd J6
conne ctors for corrosion /
loo se ness o n th e male
pin s.
Y ES
Clean /tighten p ins as
ne eded.
DONE
Re se t po we r to He ate r
and re try. Heater shou ld
fir e.
MASTERTEMP ® Pool and Spa Heater Installation and User's Guide
Ch eck Hea t Exchan ger
Co il fo r leaks, limin g, soot,
or low flow.
YES
YES
Ch eck Thermal
Re gula tor : Op en at
120˚ ?
NO
Co rrect p roble m;
He ater should fire .
NO
YE S
Ch eck Thermal -Regula tor :
Seats cor rectly?
NOT O K
Correct Fue l Supp ly, re se t
Heater and r etr y. Heater
sh ould fire corr ectly.
NO
NO
Replace Sta ck Flue Sensor
DO NE
Re se t po we r to He ate r and
retry. Hea te r sho uld fire.
NO
Repe at checks on fuel
supp ly, Thermal Regulato r,
check for cor rect orifices,
etc.
Y ES
NO
Do es the Dig ita l
Te mp erature Displa y show
Error Co de "E0 5" or "E 06"?
NO
NO
NO
Rep lace Heater
YES
(HD ) Membr ane P ad.
Rep lace Heater
Con tro l Board .
Reset power to Heater a nd
re try. Heater shou ld fi re.
Che ck Heat Exch ange r Co il fo r
le aks, liming, soot, or low flow.
Replace Heater Control Board.
Reset power to Heater a nd
re try. Heater shou ld fi re.
NO
Replace Heater Membrane Pad.
(Basic)
Reset power to Heater an d
re try. Heater shou ld fir e.
DONE
DONE
NO
DONE
NO
DO NE
Rev. H 9-5-12