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P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
Status screen fault displays — when fault is tripped, display will show fault message, beep and close the alarm contact (for
Table 11
remote alarm); the fault displays for a second, then is followed by the time the fault occurred. The fault and time toggle once per
second until the condition is corrected. NOTE: Momentary closure across J10B terminals ALARM SILENCE will silence the alarm.
FAULT EVENT &
INTERLOCK
TERMINALS
CAUSE/Discussion
DISPLAY
Action required to
reset from fault
AIR SWITCH (BLOWER)
Occurs if the blower remains in prepurge longer than two
minutes. The boiler is shut down until the fault is corrected.
The display continues showing the SUPPLY, HEADER or
other temperature, whichever had been selected for display.
The temperature shown is the value detected at the sensor
listed.
FAULT SUPPLY
AIR SWITCH (BLOWER)
168°F
Automatically resets
control after external
limit closes
COMBUST AIR DAMPER
(J12B, terminals 7 & 8)
Occurs if closure isn’t detected across J12B terminals 7 and
8 within the allowable time after the damper is activated via
the J13 BOILER3/DAMPER contact.
LINKED/COMMON damper operation (single, common
damper):
The system is shut down until the fault is corrected, but
attempts a restart every 10 minutes.
INDEPENDENT damper operation (a damper for each
boiler):
The individual boiler is shut down until the fault is
corrected and the ON/OFF switch is cycled.
The display continues showing the SUPPLY, HEADER or
other temperature, whichever had been selected for display.
The temperature shown is the value detected at the sensor
listed.
FAULT SUPPLY
COMBUSTION AIR DAMPER
168°F
MASTER boiler —
Automatically resets
control after external
limit closes
MEMBER boiler or
stand-alone boiler —
Requires cycling of
the boiler ON/OFF
switch
FLOW SWITCH ERROR
(J11B, WTR FLW)
Occurs on failure to close of a flow switch connected to
J11B WTR FLW terminals. The boiler will restart every 10
minutes, attempting to prove flow.
The display continues showing the SUPPLY, HEADER or
other temperature, whichever had been selected for display.
The temperature shown is the value detected at the sensor
listed.
FAULT SUPPLY
WATER FLOW SWITCH
168°F
Automatically corrects
if flow is proven
Troubleshooting
(continued)
9
Fault indications
The HeatNet control monitors both boiler and external interlocks, and will
shut down the boiler and display a fault code when a problem occurs. See
Table 11 for details.
Some faults will cause the control to shut down the boiler or
system and display the message.
CALL FACTORY
. Should
this message appear, immediately contact RBI for assistance.
DO NOT attempt to correct the condition without
discussing the issue with the factory. Failure to comply could
result in severe personal injury, death or substantial property
damage.
