Verify the boiler has a demand for heat or DHW
Is the display showing “Loading” continuously?
Set your meter to DC Volts, on the back of the display read voltage between + (Blue wire) & – (Pink wire). Do you read between 4.6 and 5.4 Vdc?
Password has timed out. Neither the display or control are defective. Recycle the power to the boiler. Did problem resolve?
Check the wiring harmess fronm the control to the display. Verify the wires are tight in the harness under the screws. Are all wires connected snugly under screws?
Make necessary repairs.
Replace display and/or Sage2 control
Check for DC volts on the Sage2 control J3 molex connector (green connector on the left end of the Sage2 control) for 5Vdc. Do you have 5 Vdc?
Call Tech Services
Remove and meter the fuse on the low voltage PC board
Check wiring to low voltage board. Verify thermostat wires are connected to R & W not R & C. Problem resolved?
Call Tech Services
Replace the Sage2 Control
Disconnect all molex connectors except connector plugged into J8-1. Did the light get steady?
Disconnect the molex connector on the secondary side of the transformer. Meter the Pink and Brown wires for 24Vac. Is there 24Vac on these wires?
Disconect the molex connect to the primary side of the transformer. Meter the Black & White wires boiler side of the connector, not the one going to the transformer. Is there 120Vac?
Replace transformer
Unplug the harness from the control and the display. Verify there is good connections between the connectors and the wires. Check continunity between each end of the blue wire and the pink wire screws. Is there continunity on both tests?
Plug in all molex connectors one at a time. When a connector is plugged in and the green light flashes there is an error on the wiring or mechanical devices to that molex connector.
Check continunity betwee J8-1 to the black wire in secondary side of trasformer harness. Is there continuity?
Perform same as as last test except test between J8-2 & the Brown wire in the harness. Is there continuity?
Replace Wire Harness
Repair incoming line voltage, switch etc problems.
Replace the display
Make repairs to wires. Recheck for dc volts
Please contact Technical Support to resolve this issue.