NTI Matrix M100 Installation And Operating Instructions Manual

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NTI Matrix M100 Installation And Operating Instructions Manual Manual pdf 46 page image

46Matrix Installation and Operation Instructions13.0 TROUBLE SHOOTINGThis section is intended to assist the service technician in detecting and correcting common errors. The Matrix Boiler and FanControls are equipped with an internal diagnostic system that verifies control operation. The following series of error codes hasbeen developed to aid in diagnosing control problems:Symptom Detected Problem SolutionER1“Water Temperature Excessive”Sentry has sensed a watertemperature in excess of 250ºF atthe Water Sensor.1. If the boiler is extremely hot check for adequate water pressure andcirculation, contact NTI for assistance.2. If not hot, check for sources of grounding or shorting at the Water Sensorelectrical connections, check wiring from Sensor to Boiler (Red) Control.3. Replace Water Sensor if the resistance is not in the correct range. (Seethermister resistance charts in Figures 13.1 and 13.2)ER2“Water Sensor Short Circuit”Control has sensed a short circuitin the Water Sensor circuit.See ER1ER3“Water Sensor Open Circuit”Control has sensed an open circuitin the Water Sensor circuit.1. Check wiring to Water Sensor for open circuits or shorting to ground. (Note:ER3 will be displayed if temperature sensed is less then 0°F.)2. Replace Water Sensor if the resistance is not in the correct range. (Seethermister resistance charts in Figures 13.1 and 13.2)ER4“24V Limit Error”Control has sensed a lack of 24Von the outlet of the burner relay(B1). Lockout lasts for one hourbefore automatically resetting.1. Reset power, if error goes away the problem is intermittent and was likelycaused by a tripped limit that has automatically reset, check for adequatewater pressure and flow rate. Allow the boiler to cycle and verify properoperation including outlet water temperature and flue temperature. Ifoperation is unsuccessful and the error reoccurs:2. Matrix boilers are equipped with a low water pressure switch on the boilerreturn that requires a minimum of 10PSI to complete the 24VAC ignitioncircuit. Ensure the field-installed pressure gauge is reading a minimum of12PSI. Replace water pressure switch if plumbing and pressure is correctand if it measures an open circuit.3. Check for continuity through the 24VAC limit wiring and manifold and stacklimits, replace limits or wiring that are not a closed circuit.ER6“Flame Lock Out”Control has sensed a lack of 24Vto the gas valve during operationor a Fenwal ignition lockout.There is a problem in the ignition sequence; it could be caused by a faulty igniter,flame sensor, gas valve or improper line pressure or combustion. Check ignitionsequence to determine which component is not functioning. (Control will retryignition sequence 1 hour after ER6 code originally occurs or if control is reset)ER9 Internal Controller Fault Indicates that the Controller has lost communication with an internal processor,contact NTI.ASOAir SwitchOpenThis is displayed when the boiler isexpecting the air switch to beclosed by a differential pressuregenerated when the combustionblower turns on. It can occurmomentarily during normaloperation. A problem is indicatedwhen ASO is displayedcontinuously.1. Ensure the vinyl tubes, connected between the air switch and the ports onthe inlet pipe, are in the proper locations. Negative side of switch connectsto the port on the 1-1/2” PVC elbow.2. Check for blockage on the intake and exhaust vents.3. If fan is running the air switch may be faulty, ensure it is set at 0.2”wc.4. If fan is not running, check 120V wiring to blower, if ok remove low voltageharness from blower, if blower fails to start, replace blower, if blower doesstart the problem may be with blower or Controller.ASCAir SwitchClosedThis is displayed when the boilerhas turned the blower off and isexpecting the air switch to beopen. It can occur momentarilyduring normal operation. Aproblem is indicated when ASC isdisplayed continuously.1. Does the combustion fan run continuously at full speed while the error isdisplayed? If so check for 24V from transformer, also check transformerfuse. If 24V is present check the low voltage wiring from Controller tocombustion blower, replace Controller or Blower.2. Is the combustion fan off? If so check for water in the air switch and airswitch tubes, replace switch if necessary.3. Check venting termination with required venting described in manual.ControllerLocks-upExcessive noise, current, orvoltage spikes in the 120V powersupply.Contact NTI.Boiler Control (Red Face)Display GoesBlankNo power to control or controlfailure1. Check for 120V between terminals L1 and L2.2. If 120V exists turn power off and remove line voltage harness from Control.Then check for resistance between L1 and L2 of control, if the circuit is open(O.L) the internal fuse has blown. Check for shorts in wires leading tocirculator prior to replacing controller. (Note: If fuse is good the circuit willread between 300 and 400 Ohms.)3. If 120V not present, check wiring and for 120V at source.