1 Thetford Refrigerator N90 Troubleshooting Fridges
User Manual: Thetford Refrigerator N90
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Thetford Fridge terminology Product lines • DeLuxe line refrigerators with control knobs All refrigerators which are supplied WITHOUT the LCD display control panel. Manual Energy Control (MEC) Piëzo (V85) Manual Energy Control (MEC) Electronic Manual Energy Control (MEC) Piëzo Manual Energy Control (MEC) Electronic Isphording • DeLuxe line refrigerators with LED Smart Energy Selection (SES) LED • Premium LCD line refrigerators All refrigerators which are supplied WITH the LCD display control panel. Either Electronic Energy Selection (EES) or Smart Energy Selection (SES) Automatic Press the left button (mode selection switch), when you see Auto on the left side of the display you have a SES version when not, you have an EES version Error code 1 AC heater current is measured to be 75% below nominal current Input supplied at the fridge is stable and included between 210V and 240V No AC Input issue No Change the fuse (part 624030) Yes Check if the 5A fuse is OK Yes Check if the heater impedance is correct (in Ohm) Yes Replace Power board SES version part 631219 or EES version Part 631220 Type Min Max N90-N97N98-N100N104-N109N112-N115 312Ω 380Ω N145-N150N175-N180 218Ω 266Ω No Replace the AC heater (see Spare Parts List) Error code 2 DC heater current is measured to be 75% below nominal current Input supplied at the fridge is stable and included between 9.5V and 15.5V No DC input issue No Restore the connections No D+ input issue No Change the fuse (part 626996) Yes Check if all the connections are OK Yes Check if the D+ input is included between 9.5V and 15.5V Yes Check if the 20A fuse is OK Yes Check if the heater impedance is correct (in Ohm) Yes Replace Power board SES version part 631219 or EES version Part 631220 Type Min Max N90-N97N98-N100N104-N109N112-N115 0.93Ω 1.13Ω N145-N150N175-N180 0.88Ω 1.08Ω No Replace the DC heater (see Spare Parts List) Error code 3 AC heater is ON when it should be OFF Input supplied at the fridge is stable and included between 210V and 240V No AC input issue Yes Replace Power board SES version part 631219 or EES version Part 631220 Error code 4 DC heater is ON when it should be OFF Input supplied at the fridge is stable and included between 9.5V and 15.5V No DC input issue No D+ input issue Yes Check if the D+ input is included between 9.5V and 15.5V and if polarity is correct Yes Replace Power board SES version part 631219 or EES version Part 631220 Error code 5 Senses flame when gas should be OFF Check if the gas valve works No Replace the gas valve Yes Replace Power board SES version part 631219 or EES version Part 631220 Error code 6 Senses gas output terminal ON when should be OFF Replace Power board: - SES version part 631219 - EES version part 631220 Error code 7 Senses gas output terminal OFF when should be ON Replace Power board: - SES version part 631219 - EES version part 631220 Error code 8 AC mains supply is below 20% nominal Input supplied at the fridge is stable and included between 210V and 240V No AC input issue No Change the fuse (part 624030) Yes Check if the 5A glass fuse is OK Yes Replace Power board SES version part 631219 or EES version Part 631220 Error code 9 Gas lockout because flame fails to ignite after 30 seconds Check if there is gas to the fridge Ensure there is gas in the cylinder & that it is turned on along with all isolation tops No Yes Check if the gas lights Check if there is a spark No Yes No Yes Check if the spark continues Yes Check if the electrode gap is set at about 4 mm above the burner No No No Adjust the electrode gap to approx. 4 mm No No Replace electrode Yes Check electrode connections & look for damages Yes Check if the gas valves opens Yes Injector of the burner is clean. Flame is dense and blue. No Yes Check if the gas pressure is between 28 and 30 mb No Check the gas installation No No Yes Yes Replace Power board SES version part 631219 or EES version Part 631220 Replace the gas valve Clean the burner and the injector. Replace the burner in case of bad combustion (see Spare Parts List) Error code 10 “No engine running” signal is Present and control is in Manual DC mode To know if D+ polarity is good, select manually DC mode engine off. If no error code occurs, that means the D+ input is versed. Ensure power supply is capable to supply correct amperage. Input supplied at the fridge is stable and included between 9.5V and 15.5V No DC input issue No D+ input issue No Change the fuse (part 626998) Yes Check if the D+ input is included between 9.5V and 15.5V and if polarity is correct Yes Check if the 20A fuse is OK Yes Replace Power board SES version part 631219 or EES version Part 631220 Error code 11 No energy source is available and control is on AUTO mode Please make sure that all energy sources are available during the trial Select all the energies manually and check which error codes occur Yes See the description of the other error codes No Replace Power board SES version part 631219 Error code 12 Supply voltage DC is out of range (9.5V – 15.5V) If DC mode have been selected manually, the refrigerator is not switching automatically on another source of energy when the engine is off Input supplied at the fridge is stable and included between 9.5V and 15.5V No DC input issue No D+ input issue No Solar panel issue No Change the fuse (part 624030) Yes If RV is equipped with a solar panel. Disconnect it and check if the refrigerator is OK Yes Issue with the solar panel regulator or solar panel input can be 100% excluded Yes Check if the 5A fuse is OK Yes Contact Thetford Error code 13 Thermistor fails, control automatically switches to backup mode (BOS) Check if thermistor is present No Insert thermistor (part 623077) No Plug in correctly (5th fin from the right) No Connect correctly No Fix pins if possible Yes Check if the thermistor is plugged in correctly Yes Check if the wiring loom is connected to the power board correctly Yes Check if the pins in the wiring loom plug present and not bent or loose Yes Replace Power board SES version part 631219 or EES version Part 631220 No Broken wiring harness inside the fridge issue Replace the complete fridge see the replacement fridges overview For the partnumber of a warranty fridge When a N180 is concerned please replace the fridge door only Door number 629724-07 Error code 14 Display board and power board lost communication to each other Input supplied at the fridge is stable and included between 9.5V and 15.5V No DC input issue No Change the fuse (part 626998) No Restore the connections when not OK replace the display board Yes Check if the 2A glass fuse is OK Yes Check if the connections between the boards are OK Yes Replace Power board SES version part 631219 or EES version Part 631220 Yes Contact Thetford No Broken wiring harness inside the fridge issue Replace the complete fridge see the replacement fridges overview For the partnumber of a warranty fridge When a N180 is concerned please replace the fridge door only Door number 629724-07 Lack of performance No error code ¾ On 12 Volts Do the testing of the fridges on the manual mode Check if the input at the DC HC poles of the Power Board is > 13.5V No DC input issue No Replace Power board Yes Check if the input at the heater connection to the Power Board is > 13V SES version part 631219 or EES version Part 631220 Yes Check if the heater impedance is correct (in Ohm) Yes Check if the DC heater is properly settled Yes Contact Thetford Type Min Max N90-N97N98-N100N104-N109N112-N115 0.93Ω 1.13Ω N145-N150N175-N180 0.88Ω 1.08Ω No No Replace the DC heater (see Spare Parts List) Install the DC heater properly ¾ On 230 Volts Do the testing of the fridges on the manual mode Check if the input between the (+) and the (-) at the power board is over 230 Volts No AC input issue No Replace Power board Yes Check if the input at the heater connection to the Power Board is > 215V SES version part 631219 or EES version Part 631220 Yes Check if the heater impedance is correct (in Ohm) Yes Check if the AC heater is properly settled Yes Contact Thetford Type Min Max N90-N97N98-N100N104-N109N112-N115 312Ω 380Ω N145-N150N175-N180 218Ω 266Ω No No Replace the AC heater (see Spare Parts List) Install the AC heater properly ¾ On Gas Do the testing of the fridges on the manual mode Injector of the burner is clean. Flame is dense and blue. Gas pressure is between 28 and 30 mb No Yes Check if the thermistor is properly fitted on the 5th fin from the right Clean the burner. Replace the burner in case of bad combustion (see Spare Parts List) No Install the thermistor at the right place No Install a flame diffuser (part nr to be made) No Replace the refrigerator Yes Check if the flame diffuser is in the pipe Yes Check if the burner is set properly in front of the pipe Power board on all LCD fridges Issue : A not replaceable fuse (F5) is blowing on the power boards, caused by wrong signal in circuit (f.i. short cut). Solution : Re-settable fuse integrated on the power board. Implementation : November 1st 2007 Spare part nr. : 631219 and 631220 Compensation : 30 minutes Repair-instruction : See repair instruction part Power board old version Underside of Top Half F5 fuse is at top centre Modified power board with re-settable fuse shown in position Corrosion on all Fridges shelves Issue : Corrosion on all shelves Solution : Re-inforced coating process to prevent rusting during life time product (7 years) Implementation : June 22nd 2007 for all shelves Spare part nr. : See spare part list Compensation : 5 minutes Repair-instruction : not included Gas connections Picture Tool Torque Torque spanner 13mm 3 +1/-0 Nm Torque spanner 16mm 7.5 +1/-0 Nm Torque spanner 14mm 15 +1.5/-0 Nm Nut solenoid GV Burner – orifice adapter Gas tube assy – orifice adapter Torque spanner 11mm 10 +0.5/-0 Nm Torque spanner 19mm 12 +2/-0 Nm Torque spanner 8mm 1.5 +0.5/-0 Nm Torque spanner 17mm 20 +2/ -0 Gas tube assy – V85 GV Gas inlet tube – V85 GV Thermocouple – V85 Gasvalve Gas inlet tube - LCD
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