LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 11)

1
Service Manual - NeoTherm 500
A1
Troubleshooting - Start Here
For troubleshooting instructions, see these sections:
Section Symptom
Page
A2 Unit Will Not Fire, Blower is Not Running 2
A3 Blower Runs Continuously, No Display 4
A4 Control Unit is in “Standby” Mode 5
A5 Changing Control Settings, Change Not Complete,
Original (White) User Interface 7
A6 Unit is Running, but Building is Still Cold 8
A7 Control Unit Says “Run” but Boiler is Not Firing 9
A8 Open Safety Chain - Fault #63 9
A9 Unit Runs in High or Low Fire Only,
Current User Interface 10
A10 Unit is Noisy 10
New installation,
never ran correctly
Old installation,
ran correctly
See “Quick Check of Components
in the Safety Chain and
Firing Sequence” - Section B1
Is this a new
installation?
Did the unit ever
run correctly?
What changed?
Operating conditions?
Did you change any control settings?