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© 1995-2017 Energy Saving Products Ltd.
Check
Transformer Plugs
Connected?
Verify
24v power
between
R & C
Y
Connect
Line
Voltage plug
and
return to
start
Check that
Line Voltage
wiring
from breaker is proper
N
Line Voltage plug
connected?
Y
Y
N
N
Return to
Start
Signal from
Thermostat
? (Check across
Y1/Y2 & C or W1/W2 & C)
N
Connect
Transformer Plugs
and
return to start
Y
N
Set
Thermostat
Temperature
and Switch
for Constant Fan,
Heating or Cooling
N
Fan
running?
N
Finished
Y
Fan
running?
Y
Y
Y
Y
Check for
Continuity
through
Thermostat
N
Replace
Thermostat
N
N
Finished
Replace
24v Transformer
Disconnect
24v
Transformer plug
with two
Red Wires from middle of
Circuit Board and check for
24v
from Transformer
N
Is
T’Stat
set for
Constant
Fan
,
Cooling
or
Heating
?
Check
Resettable
Fuse
(F1) for heat -
Caution: Extremely
hot if tripped
Check for broken or
incorrect wiring between
Thermostat
and
Board
Check
24v Wiring
for a dead short and
for possible
second 24v source
being
input into the Circuit Board i.e. Y1 or
Y2 & C on 24v Output Terminals.
Y
Fix or replace
Wiring
Verify
Line Voltage
power
between
L and N
-46-
Module HE-Z DIA Diagnostics &
Trouble Shooting (5/8)
Module DIA Diagnostics & Trouble Shooting (5/8)
Troubleshooting - 24Volt Thermostat to PSB Circuit Board
Start
Refer to
Trouble
Shooting - Motor
Not Running
Refer to
Trouble
Shooting - Motor
Not Running