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Great Plains
| 411-332M | 2019-02-19
82
3P3025AH
Troubleshooting
Magnehelic Gauge Troubleshooting
If the Magnehelic gauge does not read zero with the fan
off, inspect the gauge, and re-zero as needed.
Check for chamber and breather line problems before
re-zero. Re-zero cannot accurately compensate for leaks
and blockages.
Re-zero the Magnehelic gauge on level ground with the
fan off, and if possible, under no-wind conditions. Turn
the set screw on the meter face until it reads zero from
the tractor driver’s viewing position.
Problem
Cause
Solution
Non-zero
with fan off
Zero drift
Re-zero per
instructions below
Gauge
reading
lower than
sensor
Relief port plug
missing/damaged
Replace plug
Breather line blocked
or kinked
Clear breather line
Leak in sensing line
Check line to
chamber
Gauge damaged
Check for loose
cover, damaged
O-ring
1
Figure 106
Magnehelic Gauge
29842
Port ID for Troubleshooting:
Over-pressure relief port (with plug in place).
Low-pressure port (breather/atmospheric pressure).
High-pressure port (from manifold chamber).
Alternate high/low ports are plugged.
Winter testing/maintenance advisory:
Gauge readings may be inaccurate or sluggish below 20°F
3
2
4