Problem Solving; Troubleshooting - Crestron CHV-THSTAT Operation And Installation Manual

Crestron CHV-TSTAT and CHV-THSTAT

Problem Solving

Operations and Installation Guide – DOC. 8163C

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
No display
Heating/Cooling
system not
operating
Cannot change
temperature setting
System cycles too
quickly
High temperature
variance
Troubleshooting continued on following page
POSSIBLE
CAUSE(S)
No power from Check for +24V on pins 24(C)
system and 24(R)
Check circuit breaker
powering furnace or boiler
Check P4 jumper on
thermostat board
Check thermostat wiring
Incorrect mounting to Check thermostat mounting
backplate
No power to Check circuit breaker
thermostat
Check 24V connection at
thermostat and at furnace/air
conditioner
Check circuit breaker
powering furnace or boiler
Recheck wiring connections
Flashing system Timer Guards are a safety
indicator - Short cycle feature that prevents rapid
timer not satisfied 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
The upper or lower Setpoint heat range is 38 –
temperature limits 90º F (3-38º C)
were reached
Setpoint cool range is 59-100º
F (15 – 38º C)
Anticipator/Regulation Reprogram
setting too low anticipator/regulator setting
Refer to "Thermostat Setup"
Anticipator/Regulation
setting too high
Thermostats: CHV-TSTAT and CHV-THSTAT • 85
Thermostats
CORRECTIVE ACTION