LP-719 Rev. 000 Rel. 000 Date 6.25.20
74
B. Boiler Error Codes
CH Circuit
1 01*
Overheat
Press the Reset button to clear the Error Code.
If Error happens again:
1. Check for the correct functioning and positioning of the supply and return temperature probes.
2. Check for the correct functioning and positioning of the circulation pump.
3. Check the water pressure on the pressure gauge.
Blocking
(Manual
Reset)
1 03*
Insufficient circulation or low
water pressure:
Gradient T supply> 12.6 °F / sec,
three times
Press Reset to clear the Error Code.
If Error happens again:
1. Check the water pressure on the pressure gauge.
2. Purge the air from the central heating circuit.
3. Check for the correct functioning and positioning of the supply and return temperature probes.
4. Check for the correct functioning and positioning of the circulation pump.
Blocking
(Manual
Reset)
1 04*
Insufficient circulation or low
water pressure:
Gradient T supply> 27 °F / sec.
or gradient T return> 27 °F / sec.
Press Reset to clear the Error Code.
If Error happens again:
1. Check the water pressure on the pressure gauge.
2. Purge the air from the central heating circuit.
3. Check for the correct functioning and positioning of the supply and return temperature probes.
4. Check for the correct functioning and positioning of the circulation pump.
1 05*
Insufficient circulation or low
water pressure:
T supply - T Return> 99 °F, three
times
Press Reset to clear the Error Code.
If Error happens again:
1. Check the water pressure on the pressure gauge.
2. Purge the air from the central heating circuit.
3. Check for the correct functioning and positioning of the supply and return temperature probes.
4. Check for the correct functioning and positioning of the circulation pump.
1 06*
Insufficient circulation or low
water pressure:
T Return - T supply > 18 °F,
three times
Press Reset to clear the Error Code.
If Error happens again:
1. Check the water pressure on the pressure gauge.
2. Purge the air from the central heating circuit.
3. Check for the correct functioning and positioning of the supply and return temperature probes.
4. Check for the correct functioning and positioning of the circulation pump.
1 07*
Insufficient circulation or water:
T Return - T supply > 63 °F
Press Reset to clear the Error Code.
If Error happens again:
1. Check the water pressure on the pressure gauge.
2. Purge the air from the central heating circuit.
3. Check for the correct functioning and positioning of the supply and return temperature probes.
4. Check for the correct functioning and positioning of the circulation pump.
1 08
Fill system: No water in the
primary circuit
(P <Pmin).
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Ensure the system is filled with water. Ensure all valves are open to the appliance and there are no
leaks.
2. Check wiring connections to low water pressure switch. Ensure all are secure.
3. Check low water pressure switch resistance. If resistance is not zero, replace the sensor.
4. If the problem persists, replace the main control.
Blocking
(Auto
Reset)
1 10
CH Flow temp. probe circuit
open / short circuit
This Error Code will go away when the CH temperature decreases.
If Error happens again:
1. Check CH temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
1 12
CH Return temp. probe circuit
open / short circuit
This Error Code will go away when operating temperature decreases. If Error happens again:
1. Check return temperature sensor. Ensure connections are secure.
2. Check return sensor resistance. If resistance does not match Table 33 – Sensor Temperature
Resistance - replace the sensor.
3. If the problem persists, replace the main control.
1 14
External sensor circuit open /
short circuit
The Error Code will go away when the condition is remedied.
If Error happens again:
1. Check outdoor sensor. Ensure all wiring connections are intact and secure. If the sensor wires were
secured to the wall with staples, the wires may have been damaged.
2. Check outdoor sensor resistance. If resistance does not match Table 33 – Sensor Temperature
Resistance - replace the sensor.
3. If the problem persists, replace the outdoor sensor.
NOTE:
When this error occurs, the appliance will operate at a fixed temperature for CH demands, equal
to setting 4.0.2 (or 5.0.2/6.0.2 for Zones 2/3).
Warning
1 16
Floor Thermostat contact open
1. If parameter 223 is set to 1 and a floor safety thermostat is not present, set the parameter 223 to 0
or connect a floor safety thermostat.
2. If parameter 223 is set to 1 and a floor safety thermostat is present reduce the CH set-point.
Blocking
(Auto
Reset)
Display
Description
Possible Remedies
Error
Type
