Trane TR250 Service & Installation Manual page 58

58
TROUBLESHOOTING
Figure 28:
Blower
vacuum switch
closed.
AC
Blower
vacuum switch
open.
AO
Bypass
Operation
bO
For further assistance, please contact technical service at 908-282-4897 or visit
www.trane.com/poolcomfort.
1. Check for defective
blower on relay or control
module.
2. Vacuum switch is
defective.
1. Check for faulty
vacuum switch tubing
2. Check for faulty
vacuum switch wiring or
connection.
3. Check for faulty blower
wiring or connection
4. Check for defective
vacuum switch
5. Check for defective
blower relay.
6. Vacuum switch is
defective
1. Check to see if Control
Module is in Bypass
Operation
Disconnect Blower plug fron Control Module. With heater
off, measure continuity across pins 1 and 2 of receptacle on
Control Module. If closed, control module relay is defective.
Replace control module. If OK, proceed to step 2.
Replace blower vacuum switch.
Check tubing and replace if necessary. If OK, proceed to step
2.
Inspect vacuum switch wiring. Ensure wire harness terminals
are securely fastened to spade terminals on vacuum switch. If
OK, proceed to step 3.
Inspect blower wiring. Ensure plug on blower is securely
fastened to control module. If OK, proceed to step 4.
Disconnect Blower plug from Control Module. Measure
resistance across Blower windings. Winding resistance across
lead should be in the following range; Red-to-White: 4 to
5 ohms. If measured values vary substantially from these
values, Blower is defective. Replace. If OK,
5.
Disconnect Blower plug from Control Module. Place heater in
Pool or Spa Mode. Lower set point temperature to generate
call for heat. During pre-purge period, measure for 120VAC
across pins 1 and 2. If 120VAC is not present, control module
relay is defective. Replace control module. If OK, proceed to
step 6
Replace blower vacuum switch.
This is normal display when heater is being controlled by a
remote thermostat. No service is required. If heater is not
being controlled by remote thermostat, change setting by using
the MODE key to put the heater into STANDBY. Press and
hold the DOWN key and then press and hold the MODE key.
Hold down both keys for 3 seconds until the indication ''bO''
is removed from the display.
proceed to step