Interherm heat pumps function very well in most cases. However, it doesn’t mean you should throw it away if the problem occurs. There is also a way out and in this case it is connected with the troubleshooting guide given here. It’s going to be a great help in any difficult situation. Just find the issue you faced and start the repair.
Intertherm HSA1BE Heat Pump Troubleshooting
| Error Code on indoor unit | Malfunction | Repair Method/Cause |
|---|---|---|
| EE | Indoor PCB Malfunction | Replace indoor main board |
| E2 | Anti-freeze Protection | Outdoor ambient temperature is too low |
| H4 | System overload protection | Check for dirty or blocked heat exchangers |
| H6 | Indoor motor malfunction | Check motor mounting and wiring |
| F2 | Indoor pipe temperature sensor malfunction | Measure the resistance value in the sensor |
| F1 | Return air temperature sensor malfunction | |
| UF | Indoor board malfunction | Replace indoor main board |
| H3 | Compressor overload protection | Check overload wiring |
| Lc | Compressor start-up failure | Check if the resistance of the compressor and the resistance to ground is normal. If the resistance is normal, the outdoor main board may be defective. |
| UH | Outdoor fan motor failure | Check outdoor motor |
| E5 | Low voltage protection | Check incoming power |
| U7 | 4-way valve malfunction | Replace 4-way valve |
| U1 | Compressor phase detection error | Replace outdoor main board |
| H7 | Compressor speed reduction | Check if the resistance of the compressor and the resistance to ground is normal. If the resistance is normal, the outdoor main board may be defective. |
| U5 | Current detection malfunction | Replace outdoor main board |
| F3 | Outdoor ambient temperature sensor malfunction | Measure the resistance value in the sensor |
| E4 | Discharge temperature sensor malfunction (out of range) | |
| F5 | Discharge temperature sensor malfunction (open or shorted) | |
| F4 | Condenser temperature sensor malfunction (open or shorted) | |
| P8 | Heat sink over-temperature | Is outdoor ambient temperature out of system operating range? Is heat sink blocked or damaged? |
| UU | DC over-current | — |
| P7 | Heat sink temperature sensor malfunction | Replace outdoor main board |
| FO | Low charge | Check for leaks |
| PH | DC input voltage is too high | Check incoming power supply |
| PL | DC input voltage is too low | |
| E6 | Communication malfunction | Check wiring connection |
| UA | Indoor and outdoor unit mismatched | Check system combination |
Intertherm HSA1QE Heat Pump Troubleshooting
| Green Led (DS2) | Red Led (DS1) | Mode |
|---|---|---|
| OFF | OFF | No power to control |
| Simultaneous Slow Flash | Simultaneous Slow Flash | Normal operation/ power to control |
| Alternating Slow Flash | Alternating Slow Flash | Anti-short cycle lockout |
| OFF | Slow FLASH | Low pressure switch fault (Optional) |
| OFF | ON | Low pressure switch lockout (Optional) |
| Slow FLASH | OFF | High presssure switch fault (Optional) |
| OFF | OFF | High pressure switch lockout (Optional) |
Intertherm HSH1BE Heat Pump Troubleshooting
| Miswired Module Indication | Recommended Troubleshooting Action |
|---|---|
| Green LED is not on, module does not power up | Determine if both R and C module terminals are connected. Verify voltage is present at module’s R and C terminals. Review 24VAC Power Wiring for R and C wiring. |
| Green LED intermittent, module powers up only when compressor runs | Determine if R and Y terminals are wired in reverse. Verify module’s R and C terminals have a constant source. Review 24VAC Power Wiring for R and C wiring. |
| TRIP LED is on but system and compressor check OK | Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off. Verify 24 VAC is present across Y and C when thermostat demand signal is present. If not, R and C are reverse wired. |
| TRIP LED and ALERT LED flashing together | Verify R and C terminals are supplied with 19-28VAC. |
| ALERT Flash Code 3 (Compressor Short Cycling) displayed incorrectly | Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off. |
| ALERT Flash Code 5, 6 or 7 (Open Circuit, Open Start Circuit or Open Run Circuit) displayed incorrectly | Check that compressor run and start wires are through module’s current sensing holes. Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below 0.5VAC when off. |
| ALERT Flash Code 8 (Welded Contactor) displayed incorrectly | Determine if module’s Y terminal is connected. Verify Y terminal is connected to 24VAC at contactor coil. Verify 24VAC is present across Y and C when thermostat demand signal is present. If not, R and C are reverse wired. Verify voltage at contactor coil falls below 0.5VAC when off. Review Thermostat Demand Wiring (page 4) for Y and C wiring. |
Intertherm HSH1QE Heat Pump Troubleshooting
| Status LED | Status LED Description | Status LED Troubleshooting Information |
|---|---|---|
| Green "POWER” | Module has power | Supply voltage is present at module terminals |
| Red "TRIP” | Thermostat demand signal Y is present, but the compressor is not running | 1. Compressor protector is open |
| 2. Outdoor unit power disconnect is open | ||
| 3. Compressor circuit breaker or fuse(s) is open | ||
| 4. Broken wire or connector is not making contact | ||
| 5. Low pressure switch open if present in system & Compressor contactor has failed open | ||
| Yellow “ALERT" Flash Code 1 | Long Run Time Compressor is running extremely long run cycles | 1. Low refrigerant charge |
| 2. Evaporator blower is not running | ||
| 3. Evaporator coil is frozen | ||
| 4. Faulty metering device | ||
| 5. Condenser coil is dirty & Liquid line restriction (filter drier blocked if present in system) | ||
| 7. Thermostat is malfunctioning | ||
| 8. Comfort Alert Failure | ||
| Yellow “ALERT” Flash Code 2 | System Pressure Trip Discharge or suction pressure out of limits or compressor overloaded | 1. High head pressure |
| 2. Condenser coil poor air circulation (dirty, blocked, damaged) | ||
| 3. Condenser fan is not running | ||
| 4. Return air duct has substantial leakage | ||
| 5. If low pressure switch present in system, check Flash Codel information | ||
| Yellow “ALERT" Flash Code 3 | Short Cycling Compressor is running only briefly | 1. Thermostat demand signal is intermittent |
| 2. Time delay relay or control board defective | ||
| 3. If high pressure switch present go to Rash Code 2 information | ||
| 4. If low pressure switch present go to Flash Code 1 information | ||
| Yellow “ALERT" Flash Code 4 | Locked Rotor | 1. Run capacitor has failed |
| 2. Low line voltage (contact utility if voltage at disconnect is low) | ||
| • Check wiring connections | ||
| 1 Excessive liquid refrigerant in compressor 4. Compressor bearings are seized | ||
| • Measure compressor oil level | ||
| Yellow “ALERT” Flash Code 5 | Open Circuit | 1. Outdoor unit power disconnect is open |
| 2. Com pressor circuit breaker or f use(s) is open | ||
| 3. Compressor contactor has failed open | ||
| • Check compressor contactor wiring and connectors | ||
| • Check for compressor contactor failure (burned, pitted or open) | ||
| • Check wiring and connectors between supply and compressor | ||
| • Check for low pilot voltage at compressor contactor coil | ||
| 4. High pressure switch is open and requires manual reset | ||
| 5. Open circuit in compressor supply wiring or connections & Unusually long compressor protector reset time due to extreme ambient temperature | ||
| 6. Compressor windings are damaged | ||
| • Check compressor motor winding resistance | ||
| Yellow “ ALERT " Flash Code 6 | Open Start Circuit Current only in run circuit | 1. Run capacitor has failed |
| 2. Open circuit in compressor start wiring or connections | ||
| • Check wiring and connectors between supply and the compressor “S” terminal | ||
| 1 Compressor start winding is damaged | ||
| • Check compressor motor winding resistance | ||
| Yellow "ALERT” Flash Code 7 | Open Run Circuit Current only in start circuit | 1. Open circuit in compressor run wiring or connections |
| • Check wiring and connectors between supply and the compressor “R" terminal | ||
| 2. Compressor run winding is damaged | ||
| • Check compressor motor winding resistance | ||
| Yellow “ ALERT " Flash Code 8 | Welded Contactor Compressor always runs | 1. Compressor contactor has failed closed |
| 2. Thermostat demand signal not connected to module | ||
| Yellow "ALERT" Flash Code 9 | Low Voltage Control circuit« 17VAC | 1. Control circuit transformer is overloaded |
| 2. Low line voltage (contact utility if voltage at disconnect is low) | ||
| • Check wiring connections |