550 and 551 Temperature Controllers





Fenwal 55 Temperature Controller Repair Services


Professional Repair Solutions for Fenwal Model 55 Controllers


When your Fenwal 55 temperature controller malfunctions, critical process control is compromised, leading to product quality issues and costly production delays. Control System Labs provides expert repair services for these legacy industrial temperature regulation devices.


Typical Fenwal 55 Controller Failures


Our experienced technicians routinely diagnose and repair common failure modes in these analog temperature controllers:


- Thermocouple input amplifier drift causing inaccurate temperature readings

- Relay output contact welding or coil burnout preventing proper switching operation

- Potentiometer wiper wear resulting in erratic setpoint adjustment

- Power transformer secondary winding breakdown causing voltage regulation issues

- Internal calibration circuit component aging leading to control loop instability


Comprehensive Repair Methodology


Each Fenwal 55 controller receives thorough evaluation using precision calibration equipment and thermal simulation chambers. Our repair process includes:


- Complete circuit board inspection and component testing

- Thermocouple input linearization circuit verification

- PID control algorithm parameter validation

- Output relay contact resistance measurement and replacement

- Temperature display accuracy calibration

- Extended operational testing across full temperature range


Rigorous Testing Protocol


Following repair completion, units undergo comprehensive burn-in testing including thermal cycling, setpoint accuracy verification, and alarm function validation. Each controller is calibrated to original factory specifications ensuring precise temperature regulation upon return to service.


Minimize process disruption with reliable Fenwal 55 temperature controller repairs. Contact Control System Labs for fast turnaround service that restores critical temperature control functionality while extending equipment operational life through professional component-level restoration.

132 Items Found
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Mfg. Mfg. Part Num. Description Prices
Fenwal 55-104240-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-104440-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-104140-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-103240-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-103440-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-103140-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-101240-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-101440-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-101140-(X)(X)(X) 551 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-003130-(X)(X)(X) 550 LCD Indicating Temperature Control Repair: 488.00
Fenwal 55-014240-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-014440-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-014140-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-013240-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-013440-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-013140-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-011240-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-011440-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-002440-(X)(X)(X) High Limit 1/4 DIN Temperature Control Repair: 488.00
Fenwal 55-002140-(X)(X)(X) High Limit 1/4 DIN Temperature Control Repair: 488.00
Fenwal 55-004740-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-004640-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-004240-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-004440-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-004140-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-003740-(X)(X)(X) Full Scale Proportioning 1/4 DIN Temperature Repair: 488.00
Fenwal 55-001740-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-001640-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-003440-(X)(X)(X) Full Scale Proportioning 1/4 DIN Temperature Repair: 488.00
Fenwal 55-001240-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-003420-(X)(X)(X) 550 Deviation Meter Temperature Control Repair: 488.00
Fenwal 55-001210-(X)(X)(X) 550 Non-Indicating Temperature Control Repair: 488.00
Fenwal 55-001410-(X)(X)(X) 550 Non-Indicating Temperature Control Repair: 488.00
Fenwal 55-011140-(X)(X)(X) 550 Dual Set Full Ind Motor Temperature Control Repair: 488.00
Fenwal 55-004540-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 484.00
Fenwal 55-003640-(X)(X)(X) Full Scale Proportioning 1/4 DIN Temperature Repair: 488.00
Fenwal 55-003540-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-003240-(X)(X)(X) Full Scale Proportioning 1/4 DIN Temperature Repair: 484.00
Fenwal 55-003220-(X)(X)(X) 550 Deviation Meter Temperature Control Repair: 488.00
Fenwal 55-003120-(X)(X)(X) 550 Deviation Meter Temperature Control Repair: 488.00
Fenwal 55-001440-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-001140-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 484.00
Fenwal 55-001110-(X)(X)(X) 550 Non-Indicating Temperature Control Repair: 488.00
Fenwal 55-003140-(X)(X)(X) Full Scale Proportioning 1/4 DIN Temperature Repair: 484.00
Fenwal 55-001120-(X)(X)(X) 550 Full Scale Motor Temperature Control Repair: 488.00
Fenwal 55-003110-402 550 Full Scale Motor Temperature Control Repair: 504.00
Fenwal 55-213140-363 Temperature Controller Repair: 504.00
Fenwal 55-213140 Temperature Controller Repair: 516.00
Fenwal 55-201160-401 Temperature Controller Repair: 516.00
Fenwal 55-201160-400 Temperature Controller Repair: 564.00
Fenwal 55-104240-343 Temperature Controller Repair: 492.00
Fenwal 55-104240 Temperature Controller Repair: 492.00
Fenwal 55-103440-342 Temperature Controller Repair: 516.00
Fenwal 55-103240-342 Temperature Controller Repair: 516.00
Fenwal 55-103240 Temperature Controller Repair: 492.00
Fenwal 55-103140-345 Temperature Controller Repair: 564.00
Fenwal 55-103140-343 Temperature Controller Repair: 488.00
Fenwal 55-103140-342 Temperature Controller Repair: 492.00
Fenwal 55-103140-341 Temperature Controller Repair: 492.00
Fenwal 55-103140 Temperature Controller Repair: 492.00
Fenwal 55-101440-342 Temperature Controller Repair: 516.00
Fenwal 55-101440 Temperature Controller Repair: 492.00
Fenwal 55-101140-343 1/4 DIN Temperature Controller Repair: 492.00
Fenwal 55-101140-342 Temperature Controller Repair: 516.00
Fenwal 55-101140-341 Temperature Controller Repair: 564.00
Fenwal 55-101140-340 Temperature Controller Repair: 516.00
Fenwal 55-101140-143 Temperature Controller Repair: 516.00
Fenwal 55-013440-302 Temperature Controller Repair: 564.00
Fenwal 55-013240-308 Temperature Controller Repair: 508.00
Fenwal 55-013160-400 Temperature Controller Repair: 564.00
Fenwal 55-013140-303 Temperature Controller Repair: 516.00
Fenwal 55-013140-302 Temperature Controller Repair: 492.00
Fenwal 55-011140-306 Temperature Controller Repair: 516.00
Fenwal 55-011140-303 Temperature Controller Repair: 516.00
Fenwal 55-011140-302 0-400Deg. FJ Temperature Controller Repair: 504.00
Fenwal 55-011140 Temperature Controller Repair: 488.00
Fenwal 55-004540-3SERS Temperature Controller Repair: 564.00
Fenwal 55-004540 Temperature Controller Repair: 516.00
Fenwal 55-004140-303 Temperature Controller Repair: 516.00
Fenwal 55-003840-303 Temperature Controller Repair: 488.00
Fenwal 55-003640-303 Temperature Controller Repair: 508.00
Fenwal 55-003640 Full Scale Proportioning 1/4 DIN Temperature Repair: 492.00
Fenwal 55-003560-401 Temperature Controller Repair: 504.00
Fenwal 55-003560-400 Temperature Controller Repair: 564.00
Fenwal 55-003540-700 Full Scale Proportioning 1/4 DIN Temperature Repair: 508.00
Fenwal 55-003540-303 Full Scale Proportioning 1/4 DIN Temperature Repair: 504.00
Fenwal 55-003540-302 Temperature Controller Repair: 508.00
Fenwal 55-003540 Full Scale Proportioning 1/4 DIN Temperature Repair: 508.00
Fenwal 55-003440-303 Full Scale Proportioning 1/4 DIN Temperature Repair: 508.00
Fenwal 55-003440-206 Full Scale Proportioning 1/4 DIN Temperature Repair: 564.00
Fenwal 55-003260-402 Temperature Controller Repair: 504.00
Fenwal 55-003260-401 Temperature Controller Repair: 564.00
Fenwal 55-003240-303 Full Scale Proportioning 1/4 DIN Temperature Repair: 492.00
Fenwal 55-003240 Full Scale Proportioning 1/4 DIN Temperature Repair: 504.00
Fenwal 55-003230-208 Temperature Controller Repair: 508.00
Fenwal 55-003230-109 Temperature Controller Repair: 504.00
Fenwal 55-003220-103 Temperature Controller Repair: 564.00
Fenwal 55-003220 Temperature Controller Repair: 508.00
Fenwal 55-003160-410 Temperature Controller Repair: 504.00
Fenwal 55-003160-409 Temperature Controller Repair: 564.00
132 Items Found
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