Справочник Пользователя для Honeywell THR840DUK

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Ot  Minimum boiler off time: Check proper setting 

for your system (see page 23).

Cr  Cycles per hour: Check proper setting for your 

system (see page 23).

Ot  Proportional band width: If your heating system 

is oversized for your home, you can compensate 
by increasing the width of the control proportional 
band up to 3°C.

tO  Temperature offset: In some cases, the 

thermostat must be installed in a location that 
does not accurately control temperature for 
optimum comfort in other rooms. You can set the 
thermostat to compensate for this by adjusting 
the offset.

uL  Maximum temperature: When the p button 

is pressed, the thermostat will not allow a target 
temperature above the maximum you set.

LL  Minimum temperature: When the q button is 

pressed, the thermostat will not allow a target 
temperature lower than the minimum you set.

ES ECO default temperature: This is the default 

target temperature when the thermostat is in ECO 
mode (see page 11).

HC Heating/cooling options: When set to 1, the 

thermostat can control both heating and cooling 
systems (see page 9).

OS Frost protection temperature: Minimum 

temperature allowed when the thermostat is off 
(see page 8).

EH Electric heat: Check proper setting for your 

system (see page 23).

Thermostat screen  
is blank

•  Make sure two fresh AA alkaline batteries are properly installed (see

page 18).

Heating or cooling 
system does not 
respond

•  Check thermostat batteries (see above).

•  Make sure heating or cooling system has power. Check fuses and

circuit breakers and replace or reset as needed.

•  Check wiring (pages 14-17) and system configuration (pages 20-24).

Desired temperature 
cannot be maintained

•  If above remedies cannot resolve the problem, the thermostat may

have to be moved. Make sure it is not installed near sources of hot or 
cold air (radiators, windows, heating or cooling ducts).

•  If this symbol flashes on the screen during normal operation, a fault has

occurred. Contact Honeywell Customer Care for assistance (see back 
cover for contact information).