Meaning for the LMV3 System Corrective Action
Note: Diagnostic codes are additive. If a diagnostic code appears that is not on this list, it is a combination of multiple diagnostic codes.
4 Valve proving not possible
5 Valve proving not possible
81 Fuel valve 1 (V1) leaking
The upstream gas valve failed valve proving:
1) Bubble test the gas valve to ensure the valve is not leaking. If the valve
is leaking, replace the valve.
2) Ensure that the setpoint of the valve proving pressure switch is set to
50% of the inlet pressure to the upstream valve.
83 Fuel valve 2 (V2) leaking
The downstream gas valve failed valve proving:
1) Bubble test the gas valve to ensure the valve is not leaking. If the valve
is leaking, replace the valve.
2) Ensure that the setpoint of the valve proving pressure switch is set to
50% of the inlet pressure to the upstream valve.
Any # POC
A fault occurred related to a proof-of-closure (POC) switch. See diagnostic
codes for more information.
0 POC open
The POC input X5-02.2 is open when it should be closed:
1) If no POC switches are being used, change setting of parameter 237.
2) Check wiring to the fuel valves. Ensure fuel valves are wired to the
correct terminal (see Section 2 for wiring diagrams). With the manual
shutoff valves closed, ensure that the fuel valves are closing in the proper
phase (see Section 3 for sequence diagrams).
3) Ensure POC switches are closing when the valve closes. If this does not
happen, check wiring, adjust switches, or replace fuel valve actuator.
1 POC closed
The POC input X5-02.2 is closed when it should be open:
1) If no POC switches are being used, change setting of parameter 237.
2) Check wiring to the fuel valves. Ensure fuel valves are wired to the
correct terminal (see Section 2 for wiring diagrams). With the manual
shutoff valves closed, ensure that the fuel valves are opening in the proper
phase (see Section 3 for sequence diagrams).
3) Ensure POC switches are opening when the valve opens. If this does
not happen, check wiring, adjust switches, or replace fuel valve actuator.
64 POC open - prevention of startup
The POC input X5-02.2 was open when a call for heat was received,
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