LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 67)

57
Service Manual - NeoTherm 500
A problem with the circulator pump could appear as
a #79 error (Outlet High Limit). It could also appear
as a #63 error (LCI - Limit Control Input) if the safety
chain includes a flow switch. The SOLA controller
also can display error #51 - Pump Fault.
No
No
Check for 120V at terminals
1 and 2 on TB5.
Pump is
getting power?
Disassemble and/or replace pump
Pump sounds
different?
No
Yes
Pump is
moving water?
No
Replace pump
Pump is
running?
Yes
Yes
Disassemble and/or replace pump
B38
Pump Fault