Troubleshooting - NTI Trinity Lx150 Installation And Operation Instructions Manual

Lx Series

17.0 TROUBLESHOOTING

Observe the following precautions when servicing the boiler. Failure to comply with
these may result in fire, property damage, serious injury or death.
Servicing the Boiler

Disconnect or shut off all energy sources to the boiler: 120VAC power, water and gas.

Identify and mark wires before disconnecting or removing them.

Never bypass electrical fuses or limit devices except temporarily for testing.

Use proper personal protective equipment (PPE) i.e. eye protection, safety footwear.
These procedures should only be performed by qualified service personnel, when abnormal operation of the
boiler is suspected. The boiler incorporates a sophisticated microprocessor based control which normally
responds appropriately to varying conditions. If the boiler operation appears to be incorrect, or it is not
responding at all to a demand for heat, the following is suggested to determine and correct the problem.
Before undertaking any troubleshooting procedures it is highly recommended to have
available a digital multimeter(s) capable of measuring AC and DC volts, Amperes,
Resistance (ohms) and Continuity.
Check 120VAC and 24VAC at the Boiler
First, verify the following:

There is 120V being supplied to the boiler:
o
The circuit breaker in the electrical panel supplying power to the boiler is not tripped.
o
The service switch (if applicable) is in the ON position.

There is a heat call from the thermostat:
o
Verify 24VAC to thermostat.
o
The thermostat is placed at a sufficiently high setting to create a call for heat to the boiler.
To check for the presence of 120VAC and 24VAC at the boiler follow this procedure:

Remove the boiler front cover.

120VAC
o
Remove the Line Voltage junction box cover. First remove the #10 pan-head Phillips screw securing the
cover to the junction box. Lift the cover to release it from the boiler base and withdraw the cover from
the boiler cabinet. This will expose the Line Voltage barrier strip.
o
With an AC voltmeter set on the appropriate scale, measure the voltage across the L1 and L2 terminals
(terminals 1 and 5).
o
If 120VAC is not detected, check the electrical service as suggested above. If the service is verified,
inspect the circuit wiring from the panel to the boiler for broken or disconnected conductors.

24VAC (only check if 120VAC supply is verified).
o
Remove the Low Voltage junction box cover. First remove the #10 pan-head Phillips screw securing the
cover to the junction box. Lift the cover to release it from the boiler base and withdraw the cover from
the boiler cabinet. This will expose the Low Voltage barrier strip.
o
With an AC voltmeter set on the appropriate scale, measure the voltage across the R and C terminals
(terminals 3 and 1).
o
If 24VAC is not detected, check Fuse "C" (see below).
Installation and Operation Instructions
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Trinity Lx
79