MACH
®
Gas-Fired Boiler
Dual Fuel (NG & LP) MACH Boiler Supplement
8
2.5 T
ROUBLESHOOTING
If LOCKING HIGH GAS PRESSURE is shown on the display of the ENVI™ control, the burner operation is
interrupted, and the boiler locks out. The high gas pressure switch opens when there is excessive manifold gas
pressure for the proper operation of the boiler.
In addition, a high gas pressure error could be due to both gas valves being open. There are LED indicators on each
gas valve that illuminate when they are powered. If you observe that both gas valves are powered simultaneously,
you will get a LOCKING HIGH GAS PRESSURE error as described above. If this error is observed, call a qualified
service technician for assistance.
