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41
40
120 volts
across
terminals at
circulator?
Do burners
shut down before
gage temp
exceeds high limit
setting +15F?
Circulator
start?
120 volts at
C1&C2?
N
Remove t'stat or
zone valve end
switch wires from
T&TV terminals on
L8124E. Install
temporary jumper
across terminals T
and TV.
Does
circulator
run now?
*Def ective
L8124E-see
Note 6 on page
36.
* Boiler water
temperature
has dropped
below low limit
setting
*Loose connection in t'stat or
zone valve end sw itch w iring
*Defective t'stat or zone
component
*T'stat or zone system
miswired-consult t'stat or
zone valve manufacturer's
instructions
N
Do burner and
circulator shut
dow n at end of
call for heat?
END
Pull w ire of f of T
terminal on
aquastat. Does
boiler shut dow n?
*T'stat or
zone valve
w iring calling
for heat
*T'stat w ires
shorted
* Boiler water
temperature
has dropped
below low limit
setting
*Internal boiler
wiring
problem,
consult Crow n
representative
*Def ective
L8124E
*Sensing bulb not
bottomed out in
well
24 volts
across
T&TV?
*Seized or
defective
circulator
*Bad electrical
connection
between C1 or
C2 and
circulator
Y
N
Y
N
Y
N
Y
Y
Y
N
N
Y
Y
N
Main
burners
light?
*Boiler w ater
temperature
exceeds high limit
setting
* Defective
L8124E
Y
N