GOLD GV Water boiler series 3 — manual
XIe Troubleshooting — control module
Control Module
Make sure ground wiring is installed per wiring diagram. Good grounding is extremely important for proper operation.
Solder or water splatter between plugs and circuit board can cause improper operation of control module. Place a shield over the boiler internal controls and components during installation. Failure to comply could result in severe personal injury, death or substantial property damage.
Control indicator lights — lockout modes
See Charts 1 through 8 in this section for detailed trouble- shooting procedures.
To reset control after a lockout, turn off power at the 120 VAC service switch or turn down all thermostats. Wait 45 seconds. Then restore power or call for heat.
After an
POWER light flashing alone
Usually indicates reversed polarity of 120 VAC power wires.
POWER and TSTAT CIRC lights flashing
Usually indicates stray voltage on external thermostat circuit wires or return water temperature entering boiler sections has not reached 130 °F within 20 minutes.
POWER and LIMIT light flashing alternately
85063
Non-lockout light conditions
TSTAT CIRC light flashing alone
Usually indicates that limit circuit failed to cut off boiler at high temperaure — return water temperature sensor has sensed water over 235 °F.
POWER and PRES SWITCH lights flashing
Usually indicates pressure switch is closed when it should not be, or pressure switch failed to close within 5 minutes of blower starting.
POWER and FLAME lights flashing
Usually indicates control has had three unsuccessful ignition attempts or sensed flame when it shouldn’t be there.
Usually indicates return water temperature sensor detects water at boiler return pipe less than 40 °F. Both internal circulators will run continuously, even with no call for heat, until temperature rises.
LIMIT light flashing alone
Usually indicates an open or shorted return water temperature sensor.
Troubleshooting the GCM
See Figure 34 for location of harness plug receptacles and plugs on the control module.
70 | Part number |
