HARDY MANUFACTURING CO., INC (MODEL H3, H5, & H6) PAGE 34
Section VII 7 – 5 Trouble Shooting Guide H3,H5,&H6
COMPLAINT AREA OF TROUBLE POSSIBLE CAUSES CORRECTIVE ACTION
Water not circulating
through the heat loop
1 Pump not operating
2 Inline valves closed/bad
3 Air trapped in plumbing
4 Scale deposits in hot
water coil reducing
water flow and
restricting heat transfer.
5 Air lock in hot water
coil.
1 See area of trouble: “Pump
Operation”
2 Open or replace valves
3 Bleed lines if air is trapped
non pressured lines require
pump to be running.
4 Disconnect the inlet and
outlet of the hot water coil
and pump clean with descale
cleaning kit.
5 Bleed air from hot water coil
NO HEAT
Blowing cold air
in house
Water
temperature is
“HOT”
Power “OK”
Excessive wood
usage
Or
Overheating
(boiling)
Heater water boils
(Symptom –Popoff valve is
relieving)
1 Doors open
2 Defective door seals
3 Damper blower lid
stuck open
4 Damper aquastat
defective
5 Water lines /
connections leaking
1 Close all doors and make
sure they are securely
fastened.
2 If the seal is bad it will need
replacing. Call your local
Hardy Dealer for parts. See
Owners Manual for replacing
door seals.
3 Unplug blower motor. Check
lid and blower for creosote
buildup. Remove blower,
dissemble, clean, and oil.
4 Check temperature setting on
aquastat. Should be 170ºF. If
aquastat is allowing blower to
run until water boils, replace
aquastat.
5 Repair or replace all lines or
connections that are leaking.
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