TROUBLESHOOTING
HeatNet Control V3 2.x
Page 85
Troubleshooting
This section is included as an aide to help troubleshoot
problems with the setup and operation of the boiler. See
Appendix A
for additional fault messages.
Situation:
Nothing happens when the power switch is turned
on.
1.
If the Ignition Control is active, but the front panel
display is inactive check:
a.
Cable and cable polarity from the control board to
the display.
b.
J14 on control board. The transformer supplies
24vac to power the control.
c.
Check for 120vac on the primary of the
transformer and 24vac on the secondary. If one of
the 24vac interlocks has been shorted to ground or
the 24vac output is low, the transformer may be
damaged or a 24vac circuit may be miss-wired.
The H-Net control is equipped with resettable
fuses on the power input circuit. Wiring
power incorrectly to the unit will cause these
fuses to open. Once the incorrect wiring is
corrected, the fuses should reset themselves in
less than 5 minutes.
Situation:
You get the error message for the Combustion Air
Damper.
1.
The prove switch for the combustion air damper is not
closing. Check to make sure the dampers are being
controlled by the output relay. Also check to make sure
the prove switch is wired and working properly.
2.
If (1.) has been done and you are using SPARE 1 and
you continue to get the error message, check the sensor
TYPE specified for sensor #5 in the sensors menu. If it
is set to NONE the controller will not recognize the
closed circuit. Set the Sensor #5 to ON/OFF.
3.
If you are not using the combustion air damper then it
needs to be disabled in the AUX FUNCTIONS menu.
Situation:
The display is displaying random characters or the
control keeps resetting.
There may exist a grounding problem with the controller or
one of the boilers, pumps, contactors or other devices
connected to it. If all grounding is correct, there may be an
issue with radiated or induced electrical noise (interference).
This may be caused by, arcing across a contactor's contacts
when starting a pump motor, or a large electrical load. It
may also be caused by, the ignition transformer being
improperly grounded, or the spark gap set incorrectly.
1.
Attempt to identify the noise source:
2.
What is the boiler/controller trying to do at the time of
the failure?
3.
Is the boiler on the same circuit as the noise source?
(the boiler should have isolated power.)
4.
Are shielded sensor wires used? (Ensure the shields are
grounded only at the boiler control end.)
5.
Are any sensors or sensor wires located near a
transmitting antenna? (Move sensor)
Situation:
There are no heating boilers on.
1.
Check the settings for WWS SETPOINT, WARM
WEATHER SHUTDOWN; if the outdoor air
temperature is above the WWS SETPOINT and
WARM WEATHER SHUTDOWN is set to YES, the
circulator pump relay will be locked out and the heating
boilers will not fire.
2.
If the water temperature is within the heating band
around the setpoint, boilers will not come on. The water
temperature must fall below the lower band limit to
begin firing boilers.
Situation:
Unable to change the # of Boilers in the BOILERS
menu.
1.
In H-Net method, the KN-Series control auto-detects
the boilers in the system and adjusts the # of boilers
accordingly.
2.
Using H-NET, if the # of Boilers is not being adjusted
properly to the actual amount of boilers in the system,
check each boiler. There can only be (1) master boiler,
but there can be up to 15 member boilers. Currently, a
total of 16 boilers in a system.
