HTP heat pump troubleshooting 26

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PART 7 – MAINTENANCE CHECKLIST AND ERROR CODES
Before calling for service, follow the troubleshooting tips below. You may not have to call for service.

PROBLEM POSSIBLE CAUSES WHAT TO DO

Some amount of fan noise is normal (similar to the
blower on a central heating or cooling system). If you
Fans are used to move air through the hear an abnormal noise, like a knocking sound, or the
Water heater is
system. Fan noise volume will vary as noise level seems unusually loud, contact service.
Noisy
water is heated. If noise level has been increasing over the last weeks or
months, the filter may be dirty, thus making the fans
work harder. Clean the filter.
Water heater is If the room is smaller than 10’ x 10’ x 7’, the installation
Room is not vented properly or is too
making the must have a louvered door or other means to allow air
small
room too cold exchange with surrounding rooms.
Two drain hoses are included with your water heater.
Condensate drain hoses are not Connect the longer 6’ hose to the lower condensate
connected drain port. Connect the short 3” hose to the upper
Water dripping
condensate drain port.
down the
Remove each drain hose and clear any debris from the
outside of the Condensate drain hoses are kinked or
line. You can use a wire hanger or small screwdriver to
water heater clogged
clear out any debris in the drain port on the unit.
Inlet/Outlet water connections are not
Tighten the inlet and outlet pipe connections.
tightened
Water usage may have exceeded the Wait for the water heater to recover after abnormal
capacity of the water heater demand.
Fuse is blown or circuit breaker tripped Replace fuse or reset circuit breaker.
Make sure electric supply to water heater and
Electric supply may be off
disconnect switch, if used, are in the ON position.
Water temperature may be set too low. See Setting the Water Temperature, Part 3 C.
Not enough or Leaking or open hot water faucets. Make sure all faucets are closed.
no hot water Electric service to your home may be
Contact the local electric utility.
interrupted.
Improper wiring Do not attempt to repair wiring. Call for service.
A tripped TCO could mean there is a serious issue with
Manual reset limit (TCO)
the water heater. Call for service.
Cold water inlet temperature may be
This is normal. Colder inlet water takes longer to heat.
colder during winter months.
Water temperature is set too high See Setting the Water Temperature, Part 3 C.

Water is too
hot For your safety, DO NOT attempt repair of electrical wiring, controls, heating elements, or
safety devices. Refer repairs to qualified service personnel.
Electronic control has failed Call for service.
Water conditions in your home caused
Rumbling
a buildup of scale or mineral deposits Call for service.
Noise
on the heating elements
Relief valve
This unacceptable condition must be corrected.
producing Pressure buildup caused by thermal
Contact the water supplier or plumbing contractor for
popping noise expansion to a closed system
service. Do not plug the relief valve outlet.
or draining
An alarm
sounds and the
screen states The filter requires cleaning. A clean Follow the instructions on how to remove and clean
“The Filter filter is necessary for effective operation the filter, Part 4 D.
Needs
Cleaning”.
Table 7 – Troubleshooting Table
 27

The following table describes error codes and possible solutions. If your water heater displays an error
code, call a qualified service agent to fix the problem.

ERROR
DESCRIPTION WHAT TO DO
CODE
ALL ALL Inspect for proximity to high voltage power sources.
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T2 sensor is damaged.
E0 T2 sensor error
3. Check T2 sensor resistance.
o o o
4. Check actual temperature in Celsius 0 C ~ 60 C (tolerance +5 C)
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T3a sensor is damaged.
E1 T3a sensor error 3. Check T3a sensor resistance.
o o
4. Check actual temperature, range is 23 F to 86 F.
5. Check for damage to TXV and/or capillary probe.
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T3b sensor is damaged.
E4 T3b sensor error
3. Check T3b sensor resistance.
o o
4. Check actual temperature, range is 32 F to 86 F.
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T4 sensor is damaged.
E5 T4 sensor error 3. Check T4 sensor resistance
o o
4. Check actual temperature, range is 86 F to 230 F.
5. Check for refrigerant leakage or damaged piping.
1. Check if sensor wires are correctly connected and/or damaged.
2. Check if T5 sensor is damaged.
E6 T5 sensor error
3. Check T5 sensor resistance.
4. Check position of sensor tab, flat to be at back.
1. Powering the water heater off and restart.
E7 Heat pump error 2. Press ENTER and UP to enter Diagnostic Function and check error code
history.
1. Check if sensor wires are correctly connected and/or damaged.
Water temperature too
E8 high (T2 greater than 2. Check if T2 sensor is damaged.
o
165 F) 3. Power water heater off and restart.
4. Replace T2 sensor.
o
Checked every 30 minutes. T3a temperature should be greater than 32 F.
P0 Run condition C
Recheck after 30 minutes.
Checked every 30 minutes. Readings from (T3b – T3a) sensors must be
P1 Run condition D o
greater than 3 F.
o
P2 Run condition E Checked continuously. T4 sensor must be greater than 240 F.
1. Ensure compressor operating current and voltage match the rating label. .
P4 High compressor current
2. Check if compressor or related connections are damaged.
1. Remove the air filter and clean with water or compressed air.
P5 Air filter needs cleaning
2. Press and hold ENTER and DOWN simultaneously to reset system.
Checked 5 minutes from compressor startup. T4 temperature must increase
P6 Run condition A o
greater than 15 F.
o
P7 Run condition B Checked every 30 minutes. T4 temperature should be greater than 100 F.
1. Powering the water heater off and restart.
2. Check electrical supply voltage.
P8 Upper element error 3. Remove cover and check element connections and/or damage.
4. Check for damage to power wire through current sensor loop in control
board.
1. Powering the water heater off and restart.
2. Check electrical supply voltage.
PA Lower element error 3. Remove cover and check element connections and/or damage.
4. Check for damage to power wire through current sensor loop in control
board.
Table 8 – Error Codes - NOTE: See Figure 19 for sensor locations.