In Case Of Difficulty - Honeywell Home THR860S User Manual

Appendix

In case of difficulty

Programmer screen
is blank
Radiators are cold, or no
hot water is available
Screen displays "Not
Valid" when slider is in
Hot Water position
• Check the heating system to make sure the programmer has
electrical power.
• Check to ensure the heating and hot water channels on the
programmer are turned on. The indicator lights should be lit.
• Make sure the room thermostat and cylinder thermostat are
switched on and set to appropriate temperature levels.
• Check the boiler to see if it is operational.
• Check wiring (pages 17-20) and system configuration (pages 21-
23).
• Your THR860SWE has been configured as a "Mini-Programmer"
during installer setup. This is only valid for an uncontrolled gravity
hot water system. If you have a fully pumped system (see page 23),
to reconfigure the system for normal operation by using Function
7, or contact the professional installer who configured your
system.
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