30173 Rev B 4/29/2008
29
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
3.
Where the oil shut-off valve from the oil storage
tank is located.
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.
4.
How to operate the thermostat, and other
related accessories.
5.
How to operate the manual reset button on the
primary control, and especially when not to push the
reset button.
6.
How and where to visually inspect the venting
system for leaks or other problems.
IMPORTANT:
7.
How to inspect, clean and replace the air filter,
and other homeowner maintenance procedures.
Please ensure that the homeowner is informed and
understands:
8.
Who to call for emergency service and routine
annual service.
1.
Where the circuit breaker or fuse is located in
the main electrical panel.
9.
The terms and conditions of the manufacturer's
warranty and the contractor's warranty.
2.
Where the furnace switch is located, and the
switch "on" and "off" positions if not obvious.
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