Installation Guide

25
Flashing
LEDs
Status Recommended Corrective Action
Blank Boiler or Control is not powered
No 120 Vac Power at boiler, check breaker and wiring between breaker
panel and boiler
POWER
Steady 1 Hz
ash
Line Voltage Reversed Reverse polarity of 115 VAC supply voltage.
POWER
Flash Code 2
Microprocessor Failure Cycle power to control. Replace control if problem persists.
POWER
Flash Code 5
Water thermistors disagree
Conrm sensor is fully in well. If secure and good condition, replace
sensor.
POWER
Flash Code 6
Gas Valve Outputs in improper
state
Flame sensed during pre-purge (before gas valve signaled open). Check
the gas valve for proper operation. Replace gas valve if problem persists.
POWER
+
TSTAT/CIRC
Thermostat Input Higher than
Threshold
Check thermostat wiring.
DAMPER
Damper Switch opened after
proven closed
LEDs continue ashing until demand for heat is removed or damper switch
proven closed in ignition sequence.
POWER
+
DAMPER
Damper Failed to Open
Atmospheric Damper End Switch failed to close (end switch contacts stuck
open). Refer to Troubleshooting Section, C4.
POWER
+
DAMPER
Damper Failed to Close
Damper open. Voltage should not be present on P6-5. Control, vent
damper or wire harness is defective. While the POWER + DAMPER LEDs
ash on the control, perform the following tasks:
• Remove the call for heat (adjust thermostat or remove wire from TT
terminals.
• Check for 24Vac between P6-5 and ground.
• If voltage not present, attempt to start boiler again.
• If 24Vac is present, unplug the vent damper harness from control.
• With wire harness unplugged, check for 24Vac between P6-5 (on
Control) and ground.
• If voltage present, replace the control.
• If voltage not present, failed vent damper or wiring harness.
• Check wiring harness for shorts or mis-wiring. Replace if defective.
• If harness not defective, replace vent damper.
LIMIT Temperature Sensor Failure
Temperature sensor or interface failure (open or short connection,
increased connection resistance, dual sensor mismatch) or control
hardware failure.
- Check sensor is securely attached to control P7 connector.
- Check sensor wire is not damaged.
- If secure and in good condition, replace sensor.
- If problem persists, replace control.
FLAME
Flame Current Lower than
Threshold
Flame loss, or ame not sensed during trial for ignition. Continues ashing
until either ame is established or demand for heat is removed.
Check pilot assembly. Refer to Troubleshooting Section, C5.
POWER
+
FLAME
Flame Sensed Out of Normal
Sequence
Flame sensed out of normal sequence (before opening gas valve or after
closing gas valve). Check the gas valve for proper operation.
B. USE CONTROL LEDS TO DIRECT TROUBLESHOOTING EFFORTS
If the control detects an error, the LEDs will ash. Use the LEDs to identify the boiler problem and corrective action in the
table below. If LEDs are not ashing, proceed to Paragraph C: