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30318 R4 9/9/2005
31
TABLE C-4: SYSTEM AND GENERAL TROUBLESHOOTING continued
Problem Possible Cause Remedy
Airflow blocked or dirty air filter. Clean or replace air filter.
Supply air temperature too
hot.
Insufficient airflow.
Check all dampers. Open closed dampers including registers in unused
rooms. Check system temperature rise. If temperature rise is too high,
speed up blower fan.
Excess airflow. Check system temperature rise. Slow down blower fan if necessary.
Supply air temperature too
cool.
Excessive duct losses.
Check supply air ductwork. Seal leaky joints and seams. Insulate
ductwork if necessary.
Fan control "fan on" setting too
low.
Increase "fan on” dipswitch settings on EFT if control has this option.).
Register air deflectors may help.
Supply air temperature too
cool during first moments of
furnace cycle.
Excessive duct losses.
Check supply air ductwork. Seal leaky joints and seams. Insulate
ductwork if necessary.
FINAL CHECK OUT
ENSURE THAT ALL SAFETY
DEVICES AND ELECTRICAL
COMPONENTS HAVE BEEN SET
FOR NORMAL OPERATION.
ENSURE THAT ALL ELECTRICAL
CONNECTIONS ARE TIGHT AND
THAT THE WIRING IS SECURE.
IMPORTANT:
Please ensure that the homeowner is
informed and understands:
Where the circuit breaker or fuse is
located in the main electrical panel.
Where the furnace switch is located,
and the switch "on" and "off" positions if
not obvious.
Where the oil shut-off valve from the oil
storage tank is located.
How to operate the thermostat, and
other related accessories.
How to operate the manual reset button
on the primary control, and especially
when not to push the reset button.
How and where to visually inspect the
venting system for leaks or other
problems.
How to inspect, clean and replace the
air filter, and other homeowner
maintenance procedures.
Who to call for emergency service and
routine annual service.
The terms and conditions of the
manufacturer's warranty and the
contractor's warranty.