DF Series installation manual
25
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FIREYE AND HONEYWELL TROUBLESHOOTING CHECK LIST
SYMPTOMS
ACTIONS
✓
OPEN AIR PRESSURE SWITCH
CODE 21 FIREYE
CODE 32 HONEYWELL
NOTE: While the heater is in
operation, the safety contacts
located between terminals 6 and 8 of
the FIREYE relay and terminals 6 and
7 of the HONEYWELL relay must be
closed.
There are three safety devices in series between terminals 6 and 7 of the HONEYWELL flame
safeguard relay and between terminals 6 and 8 of the FIREYE flame safeguard relay.
A) Low air pressure switch
(set at 0.2 inch of water)
The low air pressure switch
will open when there is
insufficient airflow and cause
an alarm.
Its contacts are normally
open (N.O.) when the blower
starts and it closes if the
differential pressure at the
burner exceeds 0.25 inch of
water (see the Start-up
Instructions section for more
information on the
adjustment of the burner
profile plate).
AT START UP
1. The static pressure drop in
the air ducts exceeds the
specifications.
2. Check the size of the
pulleys and adjust or change
them if necessary.
3. Adjust the opening of the
profile plate if necessary.
4. Check the blower rotation.
WHEN HEATER IS IN USE
1. Check condition of filters.
2. Check condition of belts.
3. Look for duct work
modifications.
4. Check fresh air damper
operation.
5. Replace the defective
switch.
6. Refer to the manufacturer.
B) High air pressure switch
(set at 1.2 inches of water)
The high air pressure switch
will open when there is
excessive airflow and cause
an alarm.
Its contacts are normally
closed (N.C.) and open if the
differential pressure at the
burner exceeds 1.2 inches of
water (see the Start-up
Instructions section for more
information on the
adjustment of the burner
profile plate).
AT START UP OR WHEN THE HEATER IS IN USE
1. The duct work static pressure drop does not meet the
specifications.
2. Check size of pulleys and adjust or change them if
necessary.
3. Adjust profile plate opening if necessary.
4. Replace the defective switch.
5. Refer to the manufacturer.
C) Safety high temperature
limit switch (set at 160°F)
Its contacts are normally
closed (N.C.) and opens
when the temperature of the
air after the burner exceeds
160°F.
AT START UP OR WHEN THE HEATER IS IN USE
1. Check air temperature after the burner (the safety high
temperature limit switch opens at 160°F).
2. Check modulation of the Maxitrol valve and controls as well
as the amplifier and temperature signal.
3. Check gas pressure at the burner when set at high fire.
4. Replace defective switch.
5. Refer to the manufacturer.
✓
GROUND FAULT
CODE 54 FIREYE
1. Check for proper grounding of the heater. Check for proper grounding of the flame
safeguard relay.
2. Check for faulty ground in the wiring between the heater and the electrical distribution
panel.
3. Refer to the manufacturer.
✓
FAULTY PROGRAMMER
CODE 55 FIREYE
1. Replace the programmer.
2. Refer to the manufacturer.
✓
FAULTY AMPLIFIER
CODE 56 FIREYE
1. Replace the amplifier.
2. Refer to the manufacturer.
✓
VOLTAGE DROP
CODE 5 HONEYWELL
1. While heater is in operation, check voltage at relay.
2. Check electrical connections and relay installation.
3. Refer to the manufacturer.
✓
GROUND FAULT
CODE 109 HONEYWELL
1. Check for proper grounding of the flame safeguard relay.
2. The main current and neutral wires are inverted.
3. Refer to the manufacturer.
