Crown Boiler CWI379, CWI172, CWI345, CWI310, CWI103, CWI276, CWI Series, CWI069 C1&C2?, T&Tv?, C2 and

Circulator

Y

Do burners

Do burner and

shut dow n before

Y

Y

start?

gage temp

circulator shut

END

exceeds high limit

dow n at end of

call for heat?

N

Main

setting +15F?

burners

Y

light?

N

N

N

*Boiler w ater

temperature

*Defective

exceeds high limit

L8124E

setting

* Defective

*Sensing bulb not

bottomed out in

L8124E

120 volts

N

120 volts at

w ell

across

C1&C2?

Y

terminals at

circulator?

N

Y

Pull w ire off of T

N

terminal on

Remove t'stat or

24 volts

aquastat. Does

zone valve end

Y

boiler shut dow n?

sw itch w ires from

across

T&TV terminals on

T&TV?

L8124E. Install

N

Y

temporary jumper

*Seized or

across terminals T

and TV.

defective

circulator

*T'stat or

zone valve

Does

N

w iring calling

*Defective

for heat

circulator

L8124E-see

run now ?

*T'stat w ires

Note 6 on page

Y

36.

shorted

* Boiler w ater

temperature

*Loose connection in t'stat or

* Boiler w ater

has dropped

zone valve end sw itch w iring

*Bad electrical

temperature

below low limit

setting

connection

has dropped

*Defective t'stat or zone

betw een C1 or

below low limit

component

C2 and

setting

*T'stat or zone system

circulator

*Internal boiler

misw ired-consult

t'stat or

w iring

zone valve manufacturer's

problem,

consult Crow n

instructions

representative

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40