User Guide

19
PN 240010923 Rev. F [07/01/2018]
7528%/(6+227,1*
WARNING
Electrical shock hazard. Turn OFF electrical power supply at man power switch before servicing unit. Service
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'LVSOD\RQ0DVWHU&RQWURO Possible Cause Corrective Action
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to correct. Power should be between 104
Vac and 127 Vac.
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device and is non replaceable. Should it
remain open, replace the control.
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18 Vac.
Transformer faulty or overloaded.
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for excessive external loading from
thermostats or other low volt devices.
Replace, remove or correct problem.
Voltage High M1, M2, M3, M4 Voltage > 32 Vac
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company to correct.
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while incoming power is less than 127 Vac
then replace transformer.
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company to correct.
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while incoming power is greater than 104
Vac then replace transformer.
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part of normal operation.
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and boiler controller
Boiler water temperature is below
minimum
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Faulty valve Replace zone valve
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Add jumper wire on zone valve terminals
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and expansion
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master control and expansions modules.
Replace if faulty.
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