Symptom:
CIRC PU MP CON TR OL OPE N
POSSIBLE CAUSES
GROU ND CI RCUI T OP E N
CIRCU LATI ON P U MP RE LAY H I GH SIDE CON TROL CIRCU IT OP E N
CIRCU LATI ON P U MP RE LAY
CABIN H EATE R CONTROL UN IT
TE S T ACTION AP PLICAB ILITY
1 WA R N I N G : N E V E R O P E R AT E T H E H E AT E R I N A N E N C L O S E D A R E A
TH AT D OES N OT HAVE EXH AU S T VEN TILATION FACILITIES . A LWAYS
VEN T THE EXHAU S T WHE N OP ERATIN G THE HE ATER. F AILU R E TO
FOLLOW TH ES E IN S TRU CTIONS CAN RES U LT IN P E RS ON AL IN J U RY
OR D E ATH .
WA R N I N G : A L L O W T H E H E AT E R A S S E M B LY T O C O O L B E F O R E P E R -
FOR MIN G A COMP ON EN T INS P E CTION /RE PAIR /REP LACE MEN T. FAIL-
UR E TO F OLLOW THES E IN STR U CTION S CAN RE SU LT IN P E RS ON AL
IN JU RY OR D E ATH .
CAU TION : D O N OT P E R F ORM TH IS TE S T U N LES S D IRE CTE D H ER E B Y
TH E HEATER P RE -TES T. ALWAYS P ERF ORM THE HEATER P RE-TES T
P RIOR TO P ERF ORMING AN Y OTHER TES T F OR TH E R ES U LT TO BE
VAL I D .
Tur n th e ign it ion off.
Rem ove t h e Cir cu la t ion P um p Rela y from th e r ela y cen t er.
Mea su r e t h e r esist a n ce bet ween gr oun d an d th e Gr ou n d ci r cu it (Cir cu la t ion P um p
Rela y con n ect or ter m in a l 85).
Is t h e resista n ce below 5.0 ohm s?
All
Ye s → Go To 2
No → Repa ir th e Gr oun d cir cuit for an open .
Per for m H E ATE R VERIF ICATION TE ST - VER 1.
72
CABI N H EAT ER
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