HTP 399M - Manual (Page 67)

67
Code Description Remedy
F02
Interrupted or shorted supply
(outlet) thermister.
1. Check the electrical connection to the thermister on the outlet manifold. Verify 5 VDC by checking in
Molex connector. Verify thermistor values by referencing the chart in this manual.
2. If connection is okay, replace thermister.
F03
Interrupted or shorted return
(inlet) thermister.
1. Check the electrical connection to the thermister on the outlet manifold. Verify 5 VDC by checking in
Molex connector. Verify thermistor values by referencing the chart in this manual.
2. If connection is okay, replace thermister.
F05
Supply (outlet) temperature
exceeds 230 o F.
1. Check circulation pump operation.
2. Assure that there is adequate flow through the boiler by accessing the status menu and assuring that
there is less than a 50
o F rise from the return thermister to the supply thermister.
F06
Return (inlet) temperature
exceeds 230 o F.
1. Check circulation pump operation.
2. Assure that there is adequate flow through the boiler by accessing the status menu and assuring that
there is less than a 50
o F rise from the return thermister to the supply thermister.
3. Check direction of flow on boiler circulator.
F09
No flame detected – The boiler
will make three attempts at
ignition before the control goes
into this lockout condition. *See
spark electrode detail.
1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electrode for the proper ¼” gap by holding two quarters together and
sliding them through the gap.
3. Remove any corrosion from the spark electrode and flame rectifier probe.
4. If there is a spark but no flame, check the gas supply to the boiler.
5. If there is a flame, check the flame sensor.
6. Check any flue blockage or condensate blocks.
F10
Loss of flame signal – The
boiler will relight 4 times before
the control goes into this lockout
condition. Will reset in 1 hour.
1. Monitor the gas pressure to the unit while in operation.
2. Assure that the flame is stable when lit.
3. Check to see if the green light on the display module is out while the boiler is running.
4. If the green light doesn’t come on or goes off during operation check the flame signal on the status
menu.
5. If the signal reads less than 1 microampere, clean the flame rectifier probe.
6. If the flame rectifier probe continues to read low, replace it.
7. Check the stability of the flame rectification signal. If the signal is unstable, you may need to replace the
burner gasket.
F11F
False flame signal – The boiler
will lock out if it senses a flame
signal when there should be
none present.
1. Turn the gas off to the unit at the service valve.
2. If the flame signal is still present replace the igniter.
3. If the flame signal is not present after turning off the gas supply, check the gas valve electrical
connection.
4. If there is no power to the gas valve, remove the valve and check for obstruction in the valve seat or
replace the gas valve.
5. Turn the gas on at the service valve after corrective action is taken.
6. Check for condensate back up. Condensate back up can damage the refractory wall. If the wall falls
against the rectifier probe, it may conduct the signal to ground, giving a false signal.
F13
Combustion fan speed low –
The boiler will lock out if it
senses that the fan speed is
less than 70% of expected rate
for more than 60 seconds.
1. Check the combustion air fan wiring.
2. Check the quality of the 24 VAC signal by measuring from any connected safety to ground. A low voltage
situation may cause a “false” error code.
3. Replace the combustion air fan.
4. Replace the control board.
F14
Combustion fan speed high –
The boiler will lock out if it
senses that the fan speed is
less than 130% of expected rate
for more than 60 seconds.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
F18 Gas Valve Error
1. Make sure the connector is correctly connected to the gas valve.
2. Check the electrical wiring from the valve to the control board.
3. Voltage readings will be from 18-22 VDC on the outlet of the gas valve plug from any pin to ground. The
connector must remain in contact with the pins.
ON THE 399M only, check the 24 VAC relay block.
4. Replace the low voltage wiring harness assembly.
5. Replace control board.
F19 Supply voltage frequency out of range. (92-132 VAC 60 Hz)
F30 Watchdog Call factory for further assistance.
F31 Parameter Memory Call factory for further assistance.
F32 Parameter Memory Write Error Call factory for further assistance.
F33 Programming Error Call factory for further assistance.
PP Parameters Programmed Press S4 to reset.
Nc Internal processor error, due to incoming voltage problems. (92-132 VAC 60 Hz) May also occur if neutral wire is broken or damaged.
F Internal Error
Table 16