INTEGRATED FURNACE |
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| TROUBLESHOOTING |
CONTROL MODULE |
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| GUIDE |
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| CHART 2 | ||
Cooling
Cycle
Check
Place thermostat system switch in cooling mode and fan switch in AUTO position. Lower temperature selection lever to call for a cooling cycle. R & Y contacts close.
2A
Does indoor
blower energize
at cooling
fan speed?
NO
YES
2B
Return thermostat
to desired
setting.
2C
2D2E
2F
Does
indoor blower
energize at heating fan speed?
NO
2G
Is 24V
Is
YES thermostat terminal YES Y connected to furnace
terminal Y?
NO
Correct wiring
from thermostat terminal Y to Y on furnace. Check operation.
With door
switch closed, jumper control terminals
R & Y.
Does
indoor blower YES energize at
cooling fan
speed?
NO
2H
Is 120V
present at YES control terminals
COOL & CIR
NEUTRAL?
NO
Repair low
voltage wiring to thermostat. Check operation.
Indoor blower fault. Repair or replace motor.
Check operation.
present across
control terminals
Y & C?
NO
2I
Is 24V
present at
control terminals
R & C?
YES
YES
| 2J |
| 2K | |
NO | Is 24V | NO | Is 120V present | |
present at | ||||
at primary of | ||||
| control terminals |
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| transformer? | ||
| G & C? |
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| YES |
| NO | |
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| 2L | |
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| Is 120V | |
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| present at | |
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| control terminals | |
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| LINE & LINE | |
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| NEUTRAL? | |
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| NO |
YES
YES
Replace control. Check operation.
Replace
transformer.
Check operation.
Repair wiring
between control and
transformer
primary. Check
operation.
TECHNICAL HELP
voltage wiring to | Repair low | power supply to | ! WARNING | |
voltage wiring | ||||
Repair low |
| Correct 120V |
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thermostat. | from transformer to | control. Check | If diagnostic indicator (LED) | |
control. Check | ||||
Check operation. | operation. | |||
| operation. |
| shows continuous flashing, turn | |
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| off gas supply at source before | |
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| disconnecting electrical power! |
191 |
