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Common Maker
Troubleshooting
Overview
This document contains testing procedures for the Common
Maker to determine installation errors and equipment faults.
Common Terms
Equipment: Any furnace, boiler, zone controller, zone valves,
etc, the thermostat is controlling.
Thermostat Cable: The cable in the wall that connects the
thermostat to the equipment. Contains two or more wires.
Thermostat Subbase: The component attached to the wall
that the thermostat fits onto. Contains the connections to the
thermostat cable wires.
Open Circuit: A break in a wire that prevents electricity from
flowing through it.
Short Circuit: An unintended
connection
between
more wires in the thermostat
cable, or between a wire and
electrical ground.
Needed Tools
The testing procedures require
a multimeter, also known as a
multitester or Volt-Ohm Meter
(VOM). Refer to the multimeter's
instructions for operation.
Installation Testing
Follow the testing method that best describes your installation
problem.
No Power at Thermostat
A
The thermostat is not powering on
Equipment Will Not Start
B
The thermostat has power but the equipment will not start
Equipment Testing
If the previous tests did not solve the issue, check that the
equipment is working.
Common Maker Test
C
Determine if the Common Maker is faulty
Thermostat Cable Test
D
Determine if the thermostat cable is damaged
two
or
00. 0
V~
V
Ω
DIGITAL
MULTIMETER
Multimeter
A
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Related Manuals for Nordic Technology Common Maker
Summary of Contents for Nordic Technology Common Maker
- Page 1 If the previous tests did not solve the issue, check that the equipment is working. Common Maker Test Page 4-5 Determine if the Common Maker is faulty Thermostat Cable Test Page 6 Determine if the thermostat cable is damaged Page 1 of 6...
- Page 2 No Power at Thermostat Troubleshooting Problem: The Common Maker and thermostat are installed but the thermostat is not receiving power. Remove the thermostat from its subbase. Set the multimeter to ‘Volts AC’ (V~) and measure between the subbase ‘R’ (or ‘Rc’) and ‘C’ terminals. It should read between 23-28 volts.
- Page 3 2. Some equipment requires an external transformer to be wired into the switching side of the Common Maker, as shown in diagram ‘E’ in the instructions. Check if this is the correct wiring by referencing the previous system wiring or the manufacturer’s wiring diagram for the equipment.
- Page 4 ‘Equipment Will Not Start’ section did not resolve the issue. This test will determine if there is a fault in the Common Maker. It can be tested either at the equipment transformer (page 5) or a bench power supply (page 6).
- Page 5 ‘Equipment Will Not Start’ section did not resolve the issue. This test will determine if there is a fault in the Common Maker. It can be tested either at the equipment (page 5) or a bench power supply (page 6).
- Page 6 Thermostat Cable Test Troubleshooting Problem: The Common Maker and thermostat are installed, the thermostat is not receiving power, and the ‘No Power at Thermostat’ section did not resolve the issue. This test will determine if there is a fault in the thermostat cable.