A2 - unit will not fire - blower is not running, Unit will not fire - blower is not running, Unit will not fire, blower is not running – LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual User Manual
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2
Service Manual - NeoTherm 500
Unit Will Not Fire - Blower is Not Running
A2
No
Yes
Check 120V AC electrical power.
Display is lit?
No
Check for correct “call for heat” signal.
(5-6 on TB7)
Blower-related
problem?
Disconnect sensor for Outdoor Reset
(if used)
No
System operates
normally?
Yes
(continued)
Yes
Yes
Short contacts:
Central Heat: 5-6 on TB7
DHW: 5-6 on TB6
Original user interface shows:
Check, Pre-Purge, Run = Normal operation
Current user interface shows:
Heat demand or DHW = Normal operation
Has call for heat?
No
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