Diagnostics and Troubleshooting
UNT-SVX07J-EN 155
Troubleshooting Other Unit Functions
In some cases, the normal or abnormal operation of the
ECM may interact with other components in the system.
Generally, verification of the engine and adapter boards’
wiring and configuration should be checked if there are
unexplained abnormalities in other areas of the unit:
• Valve operation
• Electric heat operation
• Entering water temperature operation
• Damper operation
• Condensate overflow switch
A high degree of protection is provided on electric heat
units. If electric heat fails to actuate, it may be because of
one of the following events:
• Fans are failing to meet target speed. If a second motor
is not present, all settings for speeds for Motor 2
should be set to 0000.
• Hot water may be available in the changeover coil.
• The connection to analogue input 1 on the Tracer® ZN
controller may be reversed in polarity.
• Target speeds for motors may be set too high:
– The
FPRV parameter may be set incorrectly.
– The
AiPU parameter may be set incorrectly.
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