Checking the safety interlocks - continued – LAARS NeoTherm NTV (Sizes 150–285 MBTU/h) - Service Manual User Manual
Page 27
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17
Service Manual NeoTherm 80 - NeoTherm 285
Checking the Safety Interlocks - continued
B3
cont.
24V AC is
present?
(other safety
switches closed)
Yes
No
Check for 24V AC at
terminal J6-1.
With boiler attempting to run,
check for 24V AC across
two leads on air pressure switch.
24V AC is
present?
(switch open)
Yes
“Checking Condensate Trap Level Switch”
No
“Checking the Air Pressure Switch”
NT unit should be trying to fire.
If not firing, control panel should
be displaying an error code.
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