tekmar 552 Thermostat Installation User Manual
Page 42
© 2014
552_D - 09/14
42 of 44
A Watts Water Technologies Company
Frequently Asked Questions
Symptom
Look for...
Corrective Action
No heat
indicates heat relay W1 is on. If the
is displayed and there is no heat,
check if the zone valve or zone pump is
operating.
MODE
The thermostat is in the Off mode. Touch
the mode key to change to Heat.
No or
keys
Touch the ‘Cancel Away’ key on the display.
Heat on before
scheduled time
Optimum Start “learns” the heat up and
cool off rate of the room and starts the
heating or cooling early so that the room is
comfortable at the scheduled time.
Touching
key does
not increase
temperature
Flashing
The thermostat has reached the room
maximum setting and cannot be adjusted
any higher. If required, the room maximum
setting can be adjusted in the Set Temp
menu.
Flashing
The floor has reached the floor maximum
setting. If required, floor maximum can be
adjusted in the Set Temp menu.
Flashing
Warm weather shut down is in effect.
Increase WWSD if heat is necessary.
Touching
key does not
decrease
temperature
Flashing
The thermostat has reached the room
minimum setting and cannot be adjusted
any lower. If required, the room maximum
setting can be adjusted in the Set Temp
menu.