Laars OMNITHERM ONH1250 Assembly, Installation And Operation Instructions page 122

Page 122
Fault Fault Fault Description
SV2 Fault Codes (continued)
Category Number
Solenoid 2 7 Solenoid 2 signal fault
Solenoid 2 8 Solenoid 2 mode fault
Verification 47 Safety parameter
Needed verification
VPS 62 VPS Test Failure
VPS 63 VPS Test Failure
Detailed Description
Solenoid 2 terminal signal is not valid. Frequency or duty is
out of expected range.
Solenoid 2 expected and detected mode do not match.
One or more safety parameters have been modified and/or
waiting for verification procedure.
Valve 1 proving sequence has failed.
Warning indication for SV2
Series valve. But this condition
will likely cause a burner
controller lockout.
Valve 2 proving sequence has failed.
Warning indication for SV2
Series valve. But this condition
will likely cause a burner
controller lockout.
LAARS Heating Systems
Remediation Steps
Remove power and shut-off gas supply as necessary.
1.) Remove valve front electrical enclosure and inspect SOLENOID 2 and MV2 wiring connections for
wire engagement, seating, pin engagement and cleanliness.
2.) Ensure MV2 is wired to proper terminals on burner management system.
3.) Replace cover and restore power and gas. Reset valve and burner management system.
4.) Measure MV2 voltage for proper tolerance per valve nameplate and documentation.
5.) If fault persists, repeat above steps for L1 and N connections.
6.) If fault persists, replace valve main electronics.
1.) Reset valve and burner management system, observing valve / burner operation.
2.) If fault persists, replace valve main electronics.
Perform safety parameters verification procedure.
Go to Setup & Tests screen, press button Verify Safety Parameters.
1.) Check the piping train (is MSOV closed, piping flanges tight, O-ring leakage), main electronics wiring
and Pressure Module connection to it. For wiring, refer to the installation instructions, 32-00018. Reset
valve and repeat the VPS test.
2.) If fault persists, check system gas pressure and repeat the VPS test.
3.) If fault persists, replace Pressure Module.
4.) Accept new Pressure Module on the PRESSMOD tab in the Setup & Tests menu.
5.) Recommission the Hi-Gas and Lo-Gas pressure limits. Repeat leak detection test.
4.) If fault persists, replace valve.
1.) Check the piping train (is MSOV closed, piping flanges tight, O-ring leakage), main electronics wiring
and Pressure Module connection to it. For wiring, refer to the installation instructions, 32-00018. Reset
valve and repeat the VPS test.
2.) If fault persists, check system gas pressure and repeat the VPS test.
3.) If fault persists, replace Pressure Module.
4.) Accept new Pressure Module on the PRESSMOD tab in the Setup & Tests menu.
5.) Recommission the Hi-Gas and Lo-Gas pressure limits. Repeat leak detection test.
4.) If fault persists, replace valve.
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Comments
Warning indication
SV2 Series valve.
condition will likely
a burner controller
lockout.
Warning indication
SV2 Series valve.
condition will likely
a burner controller
lockout.