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Denise CampbellSep 23, 2025
Why has the supply temperature risen too quickly on my Alpine ALP150B Boiler?
- JJoyce RuizSep 23, 2025
Inadequate boiler water flow.
Why has the supply temperature risen too quickly on my Alpine ALP150B Boiler?
Inadequate boiler water flow.
What to do if my Alpine ALP150B Boiler is not responding to heat call?
If your Alpine Boiler isn't responding to a call for heat and the status and priority show standby, the boiler isn't detecting the call for heat. Check the thermostat or zone wiring for loose connections, miswiring, or a defective thermostat/zone control.
Why is the green power light blinking on my Alpine ALP150B Boiler control?
A blinking green power light on the control indicates a control fault. The internal power supply is repeatedly starting and stopping. Try disconnecting all terminals except 24VAC 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 faulty wiring reconnected, green light will begin to flash.
What causes a Boiler Safety Limit Open (Condition 2) on an Alpine ALP150B Boiler?
A Boiler Safety Limit Open (Condition 2) indicates that the boiler safety limit wired to terminals J6-1, 2, or 3 is open. Potential causes include loose wiring to the limit device, an auto-reset supply high limit sensor detecting a temperature in excess of 200°F.
Why is my Alpine Boiler display dark but the fan is running?
If the display is completely dark, but the fan is running, the issue is likely a lack of 24Vac power to the control. Check for loose 120Vac connection wiring between the boiler J-Box and the transformer, or loose 24 Vac connection wiring between the transformer and the control.
Why is my Alpine ALP150B Boiler display dark but the boiler still fires?
If the display is completely dark but the boiler fires, the issue is likely a lack of 5 Vdc power to the display. Check for a loose 5 Vdc connection wiring between the display and the control, or a defective display or control.
What causes ignition failure on Alpine ALP150B Boiler?
Ignition failure (Condition 11) on models ALP080B through ALP285B means flame failure after 5 tries to restart. Possible causes include no gas pressure.
What does DT inlet/outlet high mean on my Alpine Boiler?
A high DT inlet/outlet indicates that the temperature rise between the supply and return is too high. This can be due to inadequate boiler water flow. Verify that the circulator is operating and that the circulator and piping are sized per Section VI of this manual.
What does a stack sensor fault mean on Alpine ALP150B Boiler?
A stack sensor fault indicates a shorted or open flue gas (stack) temperature sensor. Check for shorted or mis-wired flue temperature sensor wiring, or a defective flue temperature sensor.
What causes a return sensor fault on an Alpine ALP150B?
A return sensor fault indicates a shorted or open return temperature sensor. This can be due to shorted or mis-wired return sensor wiring, or a defective return sensor.
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