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SECTION 11 Operating Details and Troubleshooting
11.A Operating Details
When power is turned on, the digital display will indicate
the Boiler Outlet Temperature. If a demand for heat is
received from a room thermostat or a tank aquastat (if
provided) the third decimal LED, located at the lower
right of the last temperature digit, will illuminate to
indicate that a call for heat has been received and
the startup has been initiated. See Section 9.B for
details. If the LED is not illuminated, that indicates that
the System Startup has not been initiated because all
system parameters are not in their proper operating
range. See Section SECTION 11 for details and
corrective procedures.
11.B Electrical Troubleshooting
1. Remove the front cover of the boiler.
2. Verify that 115 volts is reaching the boiler by
testing at terminals 2 and 5 on TB2.
3. Verify 24 volt transformer output by placing the
meter leads on terminals 1 and 7 on TB1. If
24VAC isn’t present, check circuit beaker located
next to the transformer. Reset (once issue is
resolved) if it is tripped. If that checks out, remove
the control panel to gain access to the internal
control wiring. Check transformer across the male
push on terminals of the transformer.
4. To perform 24 VAC voltage checks attach one
meter lead to terminal 7 of TB1. Use the other
lead to check for power on any switch on the
boiler.
5. To perform voltage checks on 120VAC attach one
meter lead to either terminal 2 or 3 of TB1. Use
the other lead to check for power at any high
voltage terminal or device.
6. Use Section 8.C on page 32 to follow the
sequence of operation, the wiring diagrams, or to
follow where the power should be based on the
information coming from the control panel’s lights.
Understanding the control panels messages will
help to localize the fault.
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
ATTENTION
de mise en garde tous les fils avant le
débranchement lors de l'entretien. Les erreurs de
câblage peut causer le mauvais et dangereux.
Vérifier le fonctionnement correct après l'entretien
WARNING
Follow local regulations with respect to installation
of carbon monoxide (CO) detectors and
manufacturer’s maintenance schedule of the
boiler.
AVERTISSEMENT
Conformez-vous aux réglementations locales
pour ce qui est de l'installation de détecteur de
monoxyde de carbone (CO) et du programme de
maintenance du fabricant de la chaudière.
Temp (F)
Ohms
77
30,000
100
17,300
120
11,200
140
7,400
160
5,000
180
3,500
200
2,400
210
2,100
Table 10. Thermistor Readings
M
INI-
T
HERM
JX
Residential Boilers
®