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of
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The blower is in operation.
The burner is not in
operation.
The flame safeguard relay
is operating normally.
1. Check if the auxiliary contact of the blower motor starter works.
2. Check selector position on the remote control panel it should be set to BURNER.
3. Check the outside temperature thermostat it prevents the burner from running if the outside temperature is over
70°F.
4. Check the burner purge lime delay relay.
5. Refer to the manufacturer.
CODE (6) Frequency noise
detected
1. Check if a high voltage source is located near the flame safeguard relay.
2. Check electrical wiring from the building junction box to the heater.
3. Refer to the manufacturer.
CODE (7) Flame Failure (PTFI)
NOTE: The flame safeguard
relay goes into alarm mode
during the pilot ignition cycle.
1. Check gas supply to the pilot.
2. Check pilot ignition transformer.
3. Check flame signal intensity (pilot only it should range between 5 and 10 VDC).
4. Check if manual and electric pilot gas supply valves are open.
5. Check condition of the flame rod ceramic replace the flame rod if necessary.
6. Refer to the manufacturer.
CODE (19) Flame Failure
(MTFI)
NOTE: The flame safeguard
relay goes into alarm mode
during the main burner
ignition period.
1. Check if there has been a gas supply shut-off while the heater was in operation.
2. Check the gas inlet pressure while the burner is in operation.
3. Check the intensity of the flame signal (while the burner is in operation it should be between 5 and 10 VDC over the
entire modulation range).
4. Refer to the manufacturer.
SYMPTOMS
ACTIONS
CODE (21) Open air
pressure switch
NOTE: While the
heater is in operation,
the safe contacts
located between
terminals 6 and 7 of
the flame safeguard
relay must be closed.
There are three safety devices in series between terminals 6 and 7 of the flame safeguard relay.
A) Low air pressure switch
(set at 0.25 inch of water)
The low pressure air switch will open
on an insufficient air flow and cause
an alarm.
Its contacts are normally open (N.O.)
when the blower starts and they
close 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 plates).
AT START UP
1. The static pressure drop in the air
ducts is higher than specified.
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 blower rotation.
WHEN HEATER IS IN USE
1. Check condition of filters.
2. Check condition of belts
3. Look for dual 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 pressure air switch will open
on an excessive air flow 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 plates).
AT START UP OR WHEN THE HEATER IS IN USE
1. The dual work static pressure drop is lower than specified.
2. Check size of pulleys and adjust or change them if necessary.
3. Adjust the profile plate opening if necessary.
4. Replace the defective switch.
5. Refer to the manufacturer.