Honeywell CM901, User Manual

Page: 15 / 18

14 15
Tr
oub
leshooting Guide
Symptom CM901 has a blank LCD scr
een
CM901 shows a flashing symbol on the LCD scr
een
The CM901’
s LCD scr
een
works but the heating does not switch on Heating switches ON or OFF too slowly or quickly Temperatur
e swings between
too hot and too cold. CM901 shows a flashing
symbol on the LCD
scr
een
P
ossib
le Cause
Batteries not installed Incorr
ect batter
y orientation
Exhausted batteries Batteries ar
e exhausted and
need r
eplacing
No power to heating system Pr
ogram does not call for
heat CM901 not connected to boiler pr
operly
CM901 not set corr
ectly for
your system CM901 not set corr
ectly for
your system Fault in CM901
Remed
y
Check to see if ther
e ar
e batteries in the batter
y
compar
tment and the paper tab has been r
emoved
Check that the batteries have been installed in the corr
ectorientation
Replace with new batteries Replace with new batteries Check that ther
e is power to the heating system.
Move the slider switch to
MAN
and pr
ess
or to
incr
ease the temperatur
e a few degr
ees above the
curr
ent r
oom temperatur
e. The heating should come
on after a few seconds. Call installer to check electrical connection between the CM901and the boiler
.
Call Installer Call Installer Remove and r
e-inser
t the batteries in the CM901.
If the
symbol does not clear itself in a few
minutes call the installer