
HARDY MANUFACTURING CO., INC (MODEL C3 & C5) PAGE 35
Corrective Action
Possible Causes
Complaint
Area of Trouble
Pump does run
1. Defective 24 volt
transformer
2. Defective wall
thermostat
(heater)
3. Defective low
temperature
sensor
4. Defective pump
relay
1. Located at existing
central unit. If 115/120
volts is being supplied
to primary side check
for 24 volts on
secondary. If 24 volts
not present, replace
transformer.
2. Located inside home.
Remove cover. Check
for 24 volts. Level the
mounting base. Blow
dust from sensing
bimetal. Adjust heat
anticipator. See
owners manual
connection
instructions.
3. Remove wires on
sensor and connect to
each other to bypass.
If pump runs replace
low temperature
sensor.
4. Check relay terminals
#7 & #8 for 24 volts. If
24 volts is present, use
ohmmeter to check
contacts. Connect
ohmmeter to terminals
#4 & #6. If no reading
replace relay.
NO HEAT
Main power
supply and
ground fault
interrupter
receptacle
“OK”
Water
temperature
is “HOT”
Pump Performance
Unplug pump and bypass relay by tying relay
wires #4 and #6 together. Plug pump back in.
8-1
General Trouble Shooting Guide (continued)
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