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AWI/TWI Troubleshooting Chart

Caution: Read page 29 before attempting to use this chart

Thermostat

calls for heat

Circulator

start?

120 volts

at L1&L2?

120 volts at

C1&C2?

*Pow er off

*Blow n fuse or
tripped breaker

*Misw ired or
loose electrical
connection in
120V line

Remove t'stat or
zone valve end
sw itch w ires from
T&TV terminals on
L8148E. Install
temporary jumper
across terminals T
and TV.

Does

circulator
run now ?

*Defective
L8148E-see
Note 6 on page
29.

*Loose connection in t'stat or
zone valve end sw itch w iring

*Defective t'stat or zone valve
end sw itch

*T'stat or zone system
misw ired-consult t'stat or
zone valve manufacturer's
instructions

Vent

damper

open?

24 volts

across B and R

(limit sw itch) in

L8148E ?

*Boiler off on

limit

*Defective

high limit.

24 volts

betw een pins

1&4 (blue&yellow )and

2&4 (orange&yellow ) on

damper end of damper

harness? See

Note 7 on page 29.

* Loose
connection
betw een
damper
harness and
L8148E

*Defective
damper
harness.

* Defective
L8148E

*Obstruction in
path of damper
blade

*Defective
damper motor

*Loose
connection
betw een damper
harness and
damper

START

24 volts

across

T&TV?

120 volts

across

terminals at

circulator?

*Seized or
defective
circulator

*Bad electrical
connection
betw een C1 or
C2 and
circulator