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ULTRATEMP ETI™ Hybrid Heater Installation and User’s Guide
Problem or Symptoms
Possible Cause
Corrective Action
Lower than Normal Head Pressure,
higher than normal suction pressure with
cold suction line and compressor and no
superheat, may have no Alarm.
TXV stuck open.
1. Check to see if TXV bulb is firmly attached to suction line, if
loose, attach firmly by tightening the clamp over the bulb and
suction line.
2. If (1) above does not work, reclaim charge and replace TXV and
filter dryer with nameplate charge.
Unusually higher than normal current.
TXV stuck closed/partially closed, insufficient
water flow, system overcharged.
See Possible Cause column for: TXV stuck closed, Insufficient water
flow, and Unit overcharged.
Low current with high superheat.
Unit undercharged.
Find source of refrigerant leak and fix. Pull vacuum and charge.
Unit runs, but breaker trips continuously.
Electrical issue.
Contact certified electrician.
BURNER TROUBLESHOOTING
Loud, high pitched whine
Flame is too rich.
Verify pressure tap between gas valve and blower inlet.
See page 11 and verify that the gas regulator setting is -0.2”
(-0.5cm) wc.
Contact a qualified technician or service agency to replace the gas
orifice.
Flame is “fluttery.”
Exhaust may have acrid smell or burner
may fail to remain lit.
Flame is too lean.
See page 11 and verify that the gas regulator setting is -0.2”
(-0.5cm) wc.
Contact a qualified technician or service agency to replace the gas
orifice.
Combustion appears normal, but flame
does not stay lit.
Flame current is not being sensed.
Check for wet or damaged igniter with low resistance to ground.
Replace with new ignitor if necessary.
Verify burner flameholder is properly grounded.
Replace ignition control module.
GAS HEAT EXCHANGER TROUBLESHOOTING
Boiling in heat exchanger.
May be accompanied by “bumping”
sounds.
1. Low water flow to heater.
Service pump and/or filter.
2. Heat exchanger plugged.
Service heat exchanger. Correct water chemistry.
3. Bypass valve stuck open.
Service bypass valve.
