Code
|
Description
|
Information
|
| AC |
Air switch circuit closed error |
Differential Pressure Switch closed when expected open. If the switch is closed before the blower has started, the ignition control board will not start the blower until the circuit is opened. |
| A1 |
Air switch circuit open before ignitor warm-up |
Differential Pressure Switch open when expected closed. This code indicates the switch circuit never closed when the blower turned on or reopened within 10 seconds of the blower starting. |
| A2 |
Air switch open after ignitor warm-up |
Differential Pressure Switch open when expected closed. This code indicates the switch opened during the heating cycle. |
| A3 |
Air switch open during postpurge |
Differential Pressure Switch open when expected closed. This code indicates the switch opened after the heating cycle was completed but before the post-purge time (30 sec.) could be completed. |
| b1 |
Ignition control board data error |
If the ignition control board does not satisfy self-diagnostic on power up or initial trial for ignition, the ignition control board will lockout until error condition is corrected. |
| b2 |
Gas valve sensed as “ON” error |
If gas valve is powered when it should be off, the heater will shut down and go into lockout. The blower will operate until error condition is corrected. |
| b3 |
Gas valve sensed as “OFF” error |
If gas valve is unpowered but flame is sensed, the blower will run for 5 seconds then start a new ignition sequence. If error occurs 10 times during a call for heat, the ignition control board will go into lockout. |
| b4 |
Data retrieval error |
If input data values are corrupted on power up or initial trial for ignition, the ignition control board will lockout until error condition is corrected. |
| bo |
Bypass operation mode |
This is a normal display when the heater is being controlled by a remote thermostat. No service is required. If the heater is not being controlled by a remote thermostat, change the setting according to the instructions in the ELECTRICAL CONNECTIONS section of the manual. |
| CE |
Communication error |
If communication between the ignition control board and the display board is not established within 3 s of power-up or is lost for 30s during operation unit will shut down and error will be displayed. The error code will be cleared upon a valid data exchange between boards. |
| EE |
EEPROM error |
An error was detected in the ignition control board. |
| HF |
High flame sensor signal error |
If flame is sensed with the gas valve off the ignition control board will go into lockout. The blower will run until error condition is corrected. When corrected, the ignition control board will run blower for 5 s then automatically restart after 2 minutes. |
| HS |
High temperature sensing error |
A) Inlet water temperature sensor is reporting a temperature in excess of 104°F. Normal operation resumes 2 minutes after inlet water temperature sensor reports temperatures of 104°F or less. This error functions for both normal and remote thermostat modes. or B) Inlet water temperature sensor is reporting a temperature change at a rate faster than 6°F in 60 seconds or less while the heater is firing, indicating a potentially damaging low water flow condition. Normal operation resumes when temperatures stabilize. If this condition is detected 3 times in a one hour period, the heater will lockout. |
| IF |
Ignition failure error |
If the maximum number of ignition retries is exceeded, the heater will shut down and go into lockout. Automatic reset is 60 minutes. |
| IO |
Igniter open error |
If the ignition control board is not in lockout and senses that the igniter circuit is open when the blower is running the ignition control board will turn off the blower and go into lockout. Automatic restart 2 min after error is corrected. |
| LO |
Limit string open error |
If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes. |
| PF |
Electrical power supply wiring error |
This code will display if supply power polarity is reversed, low voltage is detected, or if the ground path is not sufficient. Reset is immediate after error is corrected. |
| Sb |
Keypad stuck button error |
If one of the keypad buttons is closed (or pressed) for more than 30 s the unit will shut down. The error code will be cleared when the condition is corrected. |
SF
|
Temperature sensor failure error
|
If an excessive temperature difference between the redundant thermistors (5 °F or more) or a sensor “out of bounds” condition with either thermistor (less than 10°F or greater than180°F) will result in unit shut down and the error code displayed. Automatic restart is 2 minutes after the error is corrected.
|
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