Crestron CHV-TSTAT and CHV-THSTAT Thermostats
Problem Solving
Troubleshooting
The table below provides corrective action for possible trouble situations. If further
assistance is required, please contact a Crestron customer service representative.
CHV-TSTAT/CHV-THSTAT Troubleshooting
TROUBLE POSSIBLE
CAUSE(S)
CORRECTIVE ACTION
No power from
system
Check for +24V on pins 24(C)
and 24(R)
Check circuit breaker
powering furnace or boiler
Check P4 jumper on
thermostat board
Check thermostat wiring
No display
Incorrect mounting to
backplate
Check thermostat mounting
No power to
thermostat
Check circuit breaker
Check 24V connection at
thermostat and at furnace/air
conditioner
Check circuit breaker
powering furnace or boiler
Recheck wiring connections
Heating/Cooling
system not
operating
Flashing system
indicator - Short cycle
timer not satisfied
Timer Guards are a safety
feature that prevents rapid
switching between different
cycles
H1, H2, C1, C2, SB, HM, and
AX flash when the three-
minute timer guards have not
been satisfied
Wait five minutes and/or
consult HVAC contractor
Cannot change
temperature setting
The upper or lower
temperature limits
were reached
Setpoint heat range is 38 –
90º F (3-38º C)
Setpoint cool range is 59-100º
F (15 – 38º C)
System cycles too
quickly
Anticipator/Regulation
setting too low
High temperature
variance
Anticipator/Regulation
setting too high
Reprogram
anticipator/regulator setting
Refer to “Thermostat Setup”
Troubleshooting continued on following page
Operations and Installation Guide – DOC. 8163C Thermostats: CHV-TSTAT and CHV-THSTAT • 85
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