48
P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
Troubleshooting
(continued)
9
Table 10
Status screen fault displays
(continued)
Line #4 entry
Explanation
OPEN OUTSIDE SENSOR,
SUPPLY SENSOR,
RETURN SENSOR,
HEADER SENSOR,
DHW SENSOR
This indicates a sensor was detected open or not connected.
SHORT OUTSIDE SENSOR,
SUPPLY SENSOR,
RETURN SENSOR,
HEADER SENSOR,
DHW SENSOR
This indicates a sensor was detected to be shorted.
AIR SWITCH BLOWER
If the ignition control is called to start and the HeatNet control detects blower operation, but no pilot within
two minutes, the boiler locks out. This condition indicates the boiler was stuck on with no flame in the boiler.
Causing a lockout provides freeze-up protection.
LOST BOILER #
FOUND BOILER #
This indicates the HeatNet control has discovered a boiler or lost a boiler during its auto-detection process.
FAIL SAFE H-NET LOST
FAIL SAFE LOW TEMP
This occurs if Failsafe mode is activated and a failsafe condition occurs.
