How to troubleshoot a Bosch Greensource TW035 Heat Pump that does not run?
If your Bosch Heat Pump isn't running, first ensure the power supply is on by closing the disconnect. If that doesn't work, check for a blown fuse or tripped breaker and replace or reset it, making sure fuses are the correct size. Finally, verify the voltage supply; if it's below the minimum specified on the unit's data plate, contact your local power company.
What to do if my Bosch Heat Pump turns off due to high-pressure control?
If your Bosch Heat Pump shuts off due to high pressure, the discharge pressure might be too high. If in cooling mode, check for lack of water flow, excessively warm entering water temperature, or a scaled/plugged condenser. If in heating mode, check for inadequate load side fluid flow. Also, the unit might be overcharged with refrigerant, in which case you should reclaim refrigerant, evacuate, and recharge to the factory-recommended level. Check the high-pressure switch for defects or improper calibration. Furthermore, if your unit uses a UMC and a 40°F freeze sensor, this sensor being in series with the HP switch can register as a high-pressure fault.
What causes a Bosch Heat Pump to turn off due to low-pressure control?
If your Bosch Heat Pump shuts off due to low pressure, the suction pressure might be too low. If in cooling mode, check for inadequate source-side fluid flow or excessively cold entering water temperature. If in heating mode, check for inadequate water flow, excessively cold entering water temperature, or a scaled/plugged condenser. Also, the unit might be low on refrigerant; check for leaks, repair them, evacuate, and recharge to the factory-recommended level. Inspect the low-pressure switch for defects or improper calibration. If your unit uses a UMC and the DPS option, this sensor being in series with the LP switch can register as a low-pressure fault.
How to fix no flow or low flow in my Bosch Greensource TW035 Heat Pump?
If your Bosch Heat Pump has no or low flow, check the power supply and ensure the on/off switch is in the 'ON' position. Engage the heat pump contactor and inspect for broken or loose wires, repairing or tightening them as needed. Purge any air from the piping system. Remove the pump cartridge and clean it if the pump shaft/impeller is stuck. If the pump is defective, replace it. Finally, repair any kinks in the water piping and ensure it's the proper size.
Why does my Bosch Greensource TW035 keep short cycling?
If your Bosch Heat Pump is short cycling, first recalculate the heating and cooling loads to ensure the unit isn't oversized. If the thermostat is near a supply air grill, relocate it and adjust the heat anticipator. Check the wiring and controls, looking for a defective or improperly calibrated low-pressure switch.
Why is my Bosch Greensource TW035 not cooling or heating sufficiently?
If your Bosch Heat Pump isn't providing enough cooling or heating, start by checking for adequate fluid flow. Also, examine the refrigerant charge, as a low charge can cause inefficient operation. Inspect the compressor for defects—if the discharge is too low and suction pressure is too high, the compressor may not be pumping correctly and may need replacement. Also, the refrigerant system may be contaminated with moisture or non-condensables. Reclaim refrigerant, replace filter dryer, evacuate the refrigerant system, and recharge with factory recommended charge. Other potential issues include a defective reversing valve (creating a bypass), TXV issues (restrictions or defects), and incorrect operating pressures (compare to the unit's pressure/temperature chart). Finally, recalculate heati...
Explains warning symbols, keywords, and critical safety instructions.
Crucial safety guidelines for installation, servicing, and operation.
Checklist for verifying installation before energizing the unit.
Explains the Unit Protection Module, its safety controls, and indicators.
Common problems, causes, and solutions for unit operation.
Troubleshooting for HRP and common unit lockout causes.
Provides various wiring diagrams for unit components and configurations.
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