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INDICATION
Boiler is not responding to a call
for heat, "Status" and "Priority"
show "Standby".
Boiler is not responding to call for
heat, "Status" shows "Standby"
and "Priority" shows Central Heat
or Domestic Hot Water.
Boiler is Running but System or
Boiler Circulator is not running.
Display Completely Dark Fan off,
LWCO lights off, no green power
light on Control.
Display Completely Dark, Fan
running.
Blinking Green power light on
Control.
Blank Screen with "Reading"
shown.
Communication Error 2
Communication Error 3
Short Cycling
Poor Combustion
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Table 31: General Troubleshooting
POSSIBLE CAUSE
Boiler is not seeing Enable/
Disable of Domestic Demand
Input.
Boiler is not firing, or
temperature is greater than
setpoint.
Pump Not Running.
No 120 Vac Power at Boiler
due to blown high voltage
fuse or circuit breaker trip.
No 120 Vac Power at Control;
No 24 Vdc to Display.
Control Fault.
Display lost communication
with Control.
Un-configured control, or con-
trol has a memory failure.
Communication Fault.
Oversized Boiler
Incorrect Gas Valve Settings
Dirty Heat Exchanger
Leakage
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
CORRECTIVE ACTION
Check wiring for loose connections or wiring errors. If Domestic
Demand is expected check the DHW Demand/Modulation is selected
Select display Help icon and review Limit String Status.
Check wiring for loose connections or wiring errors. When there is a
Domestic Hot Water Heat Request the System or Boiler Pump will be
forced "off" when their "Run Pump for" parameter is set to "Central
heat, off DHW demand" or "Central Heat, Optional Priority". This has
been set to allow all of the heat to be provided for fast indirect water
heater recovery. After "Priority protection" time or the end of the
Domestic Hot Water Heat Request the system and boiler pumps will be
Check breaker and wiring between breaker and boiler. Replace blown
high voltage fuse. Reset tripped breaker.
Check for loose 120 Vac connection wiring between boiler J-Box and
transformer or 24 Vdc power supply. Check for loose 24 Vac connection
wiring between transformer and Control. Check blown low voltage fuse:
Replace if necessary. Check for bad transformer or bad 24 Vdc power
supply: Replace if necessary.
The green light is connected to internal power supply. The power
supply is repeatedly starting and stopping (not normal) making the
light flash. The microprocessors are not running. Try disconnecting all
terminals except 24 Vac to power the control. The green light should be
steady. If it is not, then the control is defective. If steady, start plugging
in all the connectors while watching the green light. When the faulty
wiring reconnected, green light will begin to flash.
Failure to establish Communication upon boot-up once you establish
communication, reboot display to read controller and setup display
The display-write attempt has failed. The controller is un-configured or
has a memory failure. Lockout 20 Safety Data Verification will also be
displayed. Replace Control.
Display has lost communication with controller. Check for loose or
defective display harness, defective display or defective control. Refer to
Concert Boiler Control manual for more details.
Examine system and boiler operational settings to determine what ad-
justments may be made to reduce boiler cycling. Contact Manufacturer.
If combustion is too lean or rich as a result of improper gas valve set-
tings, adjust air-fuel ratio to match factory O2 settings.
Inspect heat exchanger tubes for damage and carbon build-up. Inspect
and clean the burner assembly. Refer to the Service, Maintenance and
Inspection section of the manual for guidance.
Remove the boiler's side panels and check for flue gas leakage around
the heat exchanger, burner mounting plate, and blower transition piece.
properly.
free to run.
properly.
59
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